Pad Knockback Issue

[stab6902]

Do think a 10psi RPV is too much for rear disc brakes? Wilwood said they sell the 10 psi version for drum brakes typically

Depending on the design of the caliper piston seal and seal groove, 10 psi might be enough to cause brake drag. A very small amount of drag is okay, but you don't want to be in a situation where the rear brake temps go up as you're cruising down the highway for example.

Given your problem, I'd be inclined to start with the 10 psi RPV as well. As long as the car still rolls freely and the brakes don't heat up from dragging (use an IR thermometer on the rotor) you should be fine.