I do think that making them the same xp would reverse the problem.
But I also think that the current situation is heavily imbalanced.
So not equalize them but have them be more proportionate. As it is now, Castrum is about 30-40% of a level, while Prae is about 80-100%. Make Catsrum give less than Prae but still a decent amount, say 60-70%? More than a levelling roulette anyway, since levelling roulette gives more and takes less time and effort.
