i would say that on low PQ planets, we can't gain much profit from them. i.e., the cost of building entertainment centers and commerce centers give less bang for the buck compared to when they are built on higher PQ (like 10+) planets, what with the lower pop cap and all. Thus, I tend to let the low PQ planets to be my research outposts, since RP accumulate over the whole empire, unlike the localized MP generations. If I find the research buildings to take too long to build, i may build a factory first, and then the labs, switching between building the two accordingly, until no more tiles are left. at that point, i convert my factories to labs. of course, if i can afford it, i would by the labs outright and save me the extra step. I also ignore their happiness level unless if it goes really bad (something more likely when i set my tax rate to 80%
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I may still build a starport on the low PQ planets, but since they will take much longer to crank out ships, I would assign them to build low priority ships, e.g. ships that i plan to sell/give to another civ.
Also, for the starting home planet itself, i find the initial 24 MPs given by the civ capital is sufficient enough for the first few rounds (equivalent to having 3 factories and 3 xeno labs), and thus i would withhold factories and labs until a little bit later. My first building would be the entertainment center, which would allow me to crank the tax higher, and then probably the commerce center, taking advantage of the homeworld's high pop.
