"You will always have pressure buildup before the preloaded shims open up, and on top of that, in my opinion, digressive rebound tunes are just downright scary on jumps. (Would apply for the R85 rebound tune on the D1.)" The R85 is the most progressive rebound tune you will see in a mainstream damper. Yes it is preloaded with a ring shim but that doesn't automatically mean its digressive. Most of the preloaded rebound stack Rockshox have made are so stiff they don't open, as you mentioned - which makes them progressive. They have always used dished pistons or ring...