Sorry I'm locked out from responding.
IMHO the number of variables are too high to use a number to select an answer.
Not only dealing with the car but also the track. Where on the race track do you want to achieve what? Corner entry, exit, bumps, various radius corners, camber, off camber, and I assume other tracks may be in play? Then there are conditions such as cool tracks hot tracks, damp, oily, wet,
The simple answer is use an adjustable shock such as Penske and adjust it. As you get familiar with the car and tracks, you make different adjustments and feel what they tell you. Adjusting as you go. Checking tire temps, tire pressures, etc. keep good records of changes and conditions.
