I was the one having troubles on a tiny, suicidal map.
No shame in that. I find tiny maps with max opponents to be the most challenging game myself. One mistake and the AI can blitz you, out tech you, or worst of all - decide to gang up on you and take you out in just a few turns. Problems with "escorting" troop ships hurt the AI less because their transports are only in space for about a turn with everything cramped together. Maybe some people find this setup as easier than a gigantic map, but that has never been my experience. Is it more fun? Well, its harder and I'm sadomasachistic, so for me its more fun

I'm not sure I follow how it works??
It's more wasteful (of tiles and upkeep) than a pure all X approach, but retains flexibility and is more of a traditional approach. Say I have a planet with 5 tiles dedicated to production. I might build:
3 Industrial Sectors
2 Discovery Spheres
(I rarely use the top buildings, but I choose these just for example purposes).
If I split my sliders 33/33/33 I get:
24 manufacturing points, 12 technology points.
If instead when I want to produce things I go x/x/0 I get:
36 manufacturing points (with up to 9 tech points on non producing worlds)
Or, when I want to research I go 0/0/100 and get:
36 technology points (with up to 9 factory points on non research worlds - rare)
So I focus turn by turn to get the most out of what I need at any point. This system is NOT as good as all-x by a long shot, and it wastes both tiles and upkeep. However, my point is that even when I build mix buildings I still always focus my sliders on a given turn depending on what my empire needs. I don't trickle research, I get what I need when I need it, and otherwise focus on getting my empire up and running through production. At any point close to half of my producing buildings are "off". This strategy almost always eventually turns into all factories, because eventually I finish all of the tech tree that I will want for a game, and then I plow down all of my labs.
Its just my play style, not some super secret strategy. Hope that explains a little better.
- Wyndstar