The other thing I noticed is if the trigger linkage is off by a little the accuracy and power goes down too believe it or not.
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So you hand loaded (with a dowel? Or a golf tee?) so the pellet probe never touched/pushed/damaged the 10.34gr thin skirts?
What is odd is that it shoots well and suddenly The accuracy is gone, but seems impossible to determine the reason of what causes the accuracy problem.
Let me give you an idea, shot through your scope cam and see if your pellets are going straight, document every shot because I can’t tell you how many times I figure out the problem after just reviewing the footage in slow motion. It might help...
Try swapping out scopes.