belt throwing issues

I kepy tossing my belt. My alignment was off 1/8 of and inch. and I went to NAPA for a new belt. My belt is very short and I also have a deep grove over sized pulley on the alternator. I bekieve it was more alignment then the belt. I was also turning the belts around at 8000.

Last time out recall was over 9000 belt is still on. I plan on hooking the alternator up to a kill switch from a relay.