Okay, so when valving a shock you use a stack of one #. So all #30, #40, #90....
I've heard of "flutter stacking" which involves putting a small shim over the the large bottom shim. This is to soften the shock over light bumps but it keeps the rest of the valving for harder bumps. I read it as a way to get progressive valving out of coil overs before bypass shocks. Pretty cool
