After 6 games : 3 with civic and reform and 3 without. I constat the mod is unfortunatly a game breaker.
I really like the mod since, it adds a specialization to your empire but here are the issues:
1) happiness balance is totally broken, since you can't have unhappiness (exept on purpose), by playing normally, i realised, arriving in medieval era, i had beetween 50-100 happiness (and no happiness problem anymore in classical era), and it grows bigger and bigger (giving fealty doctrine a huge buff^^).
2) veneration of ancestor (religion civic) is SO valuable to get a religion, in multiplayer especially the most efficient strategy is to take it as fast as possible. Solution i suggest : replace lock all bonus faith until you either found you religion or you're capital is converted by a other; for the altar i propose 1) change +1 faith lock until you get a religion in your capital and +1 food to compensate)
3)finally all yield given by civic should either:
- not be included in the calculation for happiness treshhold OR
- give to each civic a big counter-part (unhappiness namely) and it must scale on era (for exemple Confédération -8 happiness is not enough since +40% gold in cities nullify the malus the further you go through era.