by Horologiom
When you reduce the favor tiles to adjust to fewer players, the turn order is getting to important:the first player to build a temple has a big advantage, the Chaosmagicians (has anyone of you played them so far?) can either be extremly powerful or really srewed - depending on their place in turn order. The same goes for some other factions.
So be free to make your experience with houserules, I am sure that in some constellations it will be great, but from a designers perspective it is more important that all factions have a chance of winning the game, than keeping the competition or the tension exactly the same in all possible player numbers.