I can only compare to what I have seen on streams to USA mir.
Warriors should level a lot slower than sins at low levels, its always been that way. The evolution in strength however is where the warrior overtakes a sin.
Sins gain power quickly but new skill wise don't evolve so great as they gain levels. A warrior however has great leaps in strength with tdb, fs, rage, etc. and eventually overtake sins in late levels.
One of the things that kept sins in check in USA mir was accuracy but that has been removed here, why I cant understand as it was a good thing in terms of balance and item creation/balancing for dps.
Buffing warriors early will either change for the better or ruin the late game but I have no idea what you plan in doing in that regards so cant comment. Changing things will ruin future plans due to overpowering if you don't have a clear idea where you are going.
So really you shouldnt ask the community as they have no idea of future plans/balance.