ace, have you tried shooting a few groups the old fashioned way...front and rear of stock on sandbags with a good cheek weld, butt snug against your shoulder, top of your trigger finger squeezing real nice while you sight with a clearly centered sight picture?
I feel a bit uncomfortable making such an obvious and simple suggestion to an experienced shooter but sometimes it is the simple things which perplex us most.
Just a thought.
Best wishes and good luck.
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