[Kevin 1G Drummer]

Shim/tappet valves are a bitch. When I put the motor for my bike back together I think I had each of the 4 cams in and back out probably 4 or 5 times to get the clearances right (mostly cuz my math skills are horseshit).

Were these new valves? My understanding is that if anything is going happen to the valve clearance, it'll get tighter, since the valve essentially stretches out a little. My suggestion is to just go down a shim size at a time till it meets tolerances. It's a bitch, but it's the easiest way to get the tolerances right. I assume you have an assortment of shims?