There are few guys on this forum that are quite capable of it and know how far to go with a particular setup. I just don't mess with the APC's other than check balance, because any work I put into it will curse the prop and sure as sugar, I'll de-tip it one way or another, probably just getting it out of the car If needed, I do cut down (1/8-1/4") the MA S-2 props and re-shape to original tip configuration, far easier than getting that bit of washout that APC does to their tips. Ever notice how performance sensitive APC's are to minor tip damage? I've got a ten years collection box worth