Might get a soundhole cover for when you are at church. It'll keep some of the frequencies from sneaking back into the body of the guitar and causing the feedback. They are really cheap and seem to work really well.
I know that when I play open mics where the PA is up really loud, I'll pick up a lot of feedback and have to either turn a certain way or swipe the soundhole cover from the guy sitting next to me...LOL.
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