You don't need that many shims bro (none usually) and you want the largest carrier in there that doesn't leak so go back up to the last one you had in there. Keep going till you get a barrel leak then go back down one. Only reason you'd need to put shims in is if the lvl 10 isn't resetting after it's been tripped. Too many shims will cause a leak. If you want the bolt to be easier on paint, go with one of the longer bolt springs. You'll have to adj the pressure up some more when you change out the spring to get it to fire again FYI.