Well, let's assume you're playing without foreign techs then building super-econ planets with the Yor is not possible, as their only economic structure (the Efficiency Center) is 1-per-planet only.
However, researching down their "Efficiency Studies" techtree will give you +45% econ increase, alongsinde with the +25% from the structure, as well as +10% from racial which will built up together as +80% throughout all planets which is quite strong, although not so strong as other civs (when you focus on all-econ and build 2 farms, 1 moral, rest all stockmarkets.)
I think the Yor were designed as a big industrialist - producing lots of stuff, as the only thing thats really spamable are their factories. (the basic stalks are somewhat inefficient)
The basic problem with that is that without doing proper research there's not much to built anyway - even if you're going so far as clustering whole sectors with starbases - these will become so costly that they can't be afforded anymore.
With research, the problem is that, again, their starting building is also 1-per-planet only, and the later research buildings are too expensive to built and maintain.
On the other hand, their 1-per-planet buildings are really strong, they have a lot of return or output, and a low maintenance. In order to cash in on that try to colonize as many planets as possible - even if they are low in PQ/tiles, or barren worlds or deep in foreign terrain (the Yor will not flip and their Super-Ability might slow down others).
Try to get the Research Matrix, Efficiency Center, Recruitment Center and MaintGrid on all of them. You'll need 2-4 stalks, too. Most of the initial research can easily be done by steming from the capital building + matrix.
As far as you need factories, build only tier 1 or 2 factories as they are incredibly cheap to maintain while still having good output. If I remember correctly their endtier factory has the greatest output ingame but it's really costly. So if you have enough tiles just plaster them with tier 1 facs its very fast upbuilt and there's good output.
Then you should aim to get population up, not superhigh but around ~14b. Once you've researched "Advanced Charging Stalks" you can overbuild the "Maintenace Grid" with one as the stalk will net the same moral bonus (+20%) but bring in another 3b people.
On extreme planets with +50% production penalty don't built facs but instead built stalks, aim to go high pop there. One downside of their stalk is that it ingraines two separate bonuses, thus, if you find a planet with both moral+pop bonus tiles present, you'll only be able to net 50% of these bonuses while other cultures can exploit them fully. That's another reason why their specialization is hampered by their tech ^^
Having a high population is about the only thing that you can actively do in order to get your economy running (and you should aim at that also because combined with the Yors +30% soldiering their worlds are hard to invade), and there are some basic tips I can give you.
Occasionally you want to lower taxes in order to get 100% approval rate for some time, esp. if the population of some/most of your planets is still low (around 1250m-4b) as these planets will not net much tax anyway so not much is lost. Later on this changes and around 7b-10b go up until the lowest approval rate is 45%.
Check each turn if this planet dropped to 44%, and lower taxes again. Most of your planets should be around 50-70%, and assuming you've got Fertility Centers everywhere there should still be a significant increase in population.
Around 14b you can try to apply maximum taxes - so that the approval rate of your worst planet is still 20% (or above). Most planets will then be red (no population growth anymore, try not be at 19% or less as then you will loose pop)
Most planets will be red between 20% - 44%, while some might be yellow above 44%. If the red ones aren't popcapped you can manually ship population to them (from the yellow ones where there's still growth) untill all planets are at 20% approval or capped. This will let you net maximal taxes. You can even go so far as to design a planet for this popgrowth by building lots of stalks + grid, and taking away as much pop that approval rate is at 100%. If that planet has moral tiles it will be easier, and here you can see that doing this wih the Yor is twice as difficult as with other races.
Ad if you don't expect an invasion on the red planets etc you can overbuild the Recruiting Center as well.
Btw you're Efficiency Center will be the prime target for enemy spies, and at a certain point it will become too expensive to get own spies for nullification. In that regard if you can spare a tile it's way better to destroy the Center and rebuilt it on another tile than wasting 10k bc on a spy.
Later the game will unlock a 1-per-planet production increasing building, and a similar for research as well. They are really costly to build and rather weak in what they are doing. On most planets, adding an extra lab/fac will net more return. Only on planets up to 20 tiles or more I'd considering these 2, and naturally, besides your basic buildings (starport, matrix, centers, stalks, grid) you must have build only either facs or labs additionally there.
I've tried to play quite a few times an all-lab or an all-fac strategy, and I can say that without techbrokering all-lab is too expensive in the start (if you built the additional labs) but all factory was even worse - tech research was way to slow so you would only end up producing crap.
So what i would do is to flip constantly between them, initally focusing more on research + colonization while filling extra spare tiles up with tier 1 facs so I could swap immediately to all military or social production once a critical tech has been researched - for example, Miniaturization II together with the Yors innate miniaturization racial will let you built colony/miner/trade/construction modules on a tiny hull - which then can be cranked out turn by turn.