I would like to adjust the drop and add some cast on to my 535. I recently purchased a 930 that came with a shim kit that I think I can use on the 535. Adding drop is easy enough as the shims are labelled but how can I add cast on? I'm thinking that I should sand the left side of the shim? Use half a shim? Too aggressive? Currently I shoot 6-8" high and 2-3" right at 40 yards.