I agree with above. I tend to be really anal with slop, trying to remove any trace (without binding of course) and that doesn't always mean same shims each side.
Howeve, interestingly, I chatted to Volker at AOC down here a few weeks back and he said he and Umino don't really care about slop - just make sure things are even and very loose! The amount of movement he had in his rear arms I found quite staggering!