It is probably due to the poor design of the Mathews grips.Most people have a problem shooting the grip and not torquing it.Try a couple different hand positions,like a high wrist and see if it gets better.If you see noticable differences,maybe removing the grip might be the answer.There are even some after market grips for the Mathews bows that help eliminate the problem but they get a little costly.
www.lancasterarchery.com sell some really good grips for the bow.
If it isn't the grip it might be cam and or idler lean.Not much can be done about cam lean but the split cable can be twisted to straighten out the idler.
Hope this helps.