What I have noticed about the rebound is if you are tword the 100% mark the rebound seems to be faster on the way out and a little stiffer on the way in
I think I would like about 50% rebound but it could take me quite some time to achieve that in all 4 shocks(and sometimes I don't have the patients). In my car at about 100% rebound my car feels bouncy landing from jumps and also does not suck up the smaller bumps as well.