I would bet you have never wheeled with anyone with big rims have you? My 20's with 35s aired down to 20psi performed very well with VERY little rock rash. 22's with 37s would have the same amount of sidewall(which is hardly rubberbands) so i would expect the same results.
Ripp, dont listen to this guy as he knows not what he speaks of
. If you want the 20's go for it and dont be scared to wheel them should you decide to do so.