OK, so a buddy of mine got me into sporting clays and now I'm using my 930 SPX a lot. I now have the hang of clays (more or less) and really enjoy it, but after a day of shooting (75-100 rds), my jaw is sore. The recoil is not bothering me at all, but can't seem to find a way to lower the impact to my right cheek. The sore / stiff jaw lasts about 2-3 days. Any ideas on how to alleviate? I've heard that adjusting pull can help, but where / up / down , etc., is unclear to me.