When I played in a game with only experienced players with no penalties at all, most players, by te way,chose to play JoaT (not CA) in a small universe which I'd agree on that JoaT is the strongest PRT in a small universe: rather cheap PRT, very fast development due to excellent starting tech, penetrating scanners right from the start and a 20% bigger planet pop and economy base (which is actually even a 22% bonus in comparison to other PRTs because all players take OBRM as well in a small universe = 1.2 JoaT x 1.1 OBRM = 32%).

That isn't 22%. It's 20% more than other OBRM races.