Rebound, is a good tuning tool for shocks, and it’s important to set/match both sides of a pair.
Set the pair of pistons to the same length, body to eyelet, and then you can use a combination of spring cups to set various rebound rates by setting how far the piston is into the body when you build.
I like more rebound on the front than the rear, allowed a little extra tuning for understeer iirc.
Adam Drake’s video is very good on this subject
This vid is the reason I ran the Aeration buggy shocks with bladders and foam inserts and the option for vented caps.