Just to confirm what has been said here already. I fly at the same field as the owner of APC props and can tell you from the horse's mouth. APC's are carefully designed and most of the thrust comes from the tips. As I recall in the neighborhood of 80% of the thrust from the APC prop is generated at the tip. Not to mention APC's are also designed to run quiet and you are also losing that effect as well, so keep that in mind when the DB police are around. I will dress the tips from minor dings on my sport planes but nothing more than a ¼” or so.