"Taking the scratches out, comes at the cost of a few pounds of drawweight - depending on the depth of the scratches."
To take care of this problem I use 2 rasps. One is the smooth side of my tractor supply co. farriers rasp. The other is some some smooth file rasp (I don't know the grades but it gets it to the consistency of almost like after using 100 - 150 grit sandpaper at a thousandth percent of the time.). You can use these two rasps real quick after each tiller check, and it only takes a little bit, so after your done tillering you only have to run it over with some 150 and the tiny scratches that are left are out. What I actually do though is finish tillering the bow with the smooth side of my farriers rasp, then get all of em out with the finer file. Then tiller check again, and fix any problems with the finer file. Then sand it with 150, and fix any tiller problems with the 150.