small blk rocker geometry

I understand the how valve geometry works on a small block and where you raise or shim the shafts when the roller tip is favoring the intake side to much and when the roller is to the exhaust side to far how you need to look at the pedastles and changing that elevation. I guess I never heard anyone tell of how much is safe to raise the shafts before they can start to become unstable. I know of guys who have went up .050 or maybe .080 but .120 seems out there to me. Maybe not?? Maybe you go as far as you need to with shims to get a good pattern and not worry about it??