It could be your problem is with the ground combat strategy. You do know that each additional lab person added to a research project is less effective than the previous one, so the spreading them around to multiple projects is more efficient overall. And I try to keep several research projects going at once. I try to keep my research balanced between offensive and defensive technologies. Cruisers are appearing and I have my first marauder flying around. I think I'm in the mid point of the game. Like you, I have 3 bases and 2 research labs. I'm playing my first game now on normal difficulty. With repeatedly getting wiped in ground combat although earlier I do fine I find I run out of money and then it is game over. One base is research, one is manufacturing, and the third is coverage only.
I basically research everything going from quickest to slowest research, I will get two research labs and go with a three base strategy.
I get to the point where eventually my teams keep getting wiped in ground combat, especially terror missions. I am playing for the third time with falling behind and not able to fight back after the first two tries. What would you think is the best research path? Assume all mods installed from community edition.