I’m already at level 60 and I really wish the progression had been slower. Many folks, once the levelling is done will lose interest in the game. I am one of those advancement people who don’t care as much for building rare kit as I do for unlocking new stuff.
1x mats on the pvp server would be better, at least a potion of the official servers. Also, getting two heads from every tiger is rediculous!
Alternatively you could half the experience gained for building, which would allow you to rebuild after a raid, but not drive you to the level cap.