my ata is 31 5/8 and cam rotation is alright. Would it be worth the trouble trying to get it back to 31 1/2 or will it be alright where it is? My bow shop says that even the new ones are not set exactly to specs and that it would still shoot fine but he would do it if I wanted to.

I wouldn't be worried about it. Adjusting the ATA will start messing with your brace heighth and timing of your rollover. If it shoots good leave it alone, the season is coming quick and you probably don't want to open pandoras box right now.. I would save it for a winter time tinker project.