I do what makes the bow shoot well,, usually dont have to do much if the arrow is close to spine,, but I am not afraid to dish it there if needed,, as your release and hold on the bow becomes better,, the bow will be more fogiving,, and if the pass is reasonable,, you can tune the bow to shoot very well,, doing very little,,
I guess my point is,, the way you are holding and shooting the bow,, is having more effect on your arrow flight,, than a small amount of wood at the pass,,