I had a 96 chevy with a rough country "6" inch lift kit. I had leveling keys as well. I had the same problem you do. I fixed it with 2 things. 1. I knocked out the little pieces of steel in the upper control arm pockets to allow for the cam bolt to actually do its job and at the same time I put GM cam bolts with 2 1/4 degree adjustment +/-. 2. AC Delco makes offset control arm bushings that will give you 1 extra degree of positive camber.
the part numbers are:
ACDELCO 45K0201 (offset control arm bushings)
...sorry I cant find the part number for the cam bolts