I cannot see how different setting would be helpful.
But I can see that 14-20 year old shocks might not be uniform in their decrepitude. IE, one might be worn, and the other might be shot.
bought these I/S shocks a few yrs ago, only had 30k on them. have them on my std/tourer now. they are much better than the std shocks. if I can't dial them in, I have a set of rebuilt 416s I can install and try.