By the time I shoot a bow in, I will have exercised it extensively through tillering, and will have already had it strung for an extended brace. I will have and have done the final tillering with 80 to 120 grit sandpaper and there will be no ridges, nicks, or undulations to deal with. Any backings, like snakeskins, etc. will also have been added long ago and those edges will have been clean up and smoothed out. Since the bow has been given such a work out and has been so refined, the bow usually doesn't drop any weight during shoot in, nor does the subsequent "final" sanding down to 320 grit.