I initially under-timed mine because my crush washer wanted to stop there (plus some comps work best when slightly under-timed). This did not work well with the BC.
My first "perception" was considerable jump to the right, however, I think from the under-timed install it was actually pushing left and I was over correcting to the right before the second shot.
I re-timed to TDC, changed to a high thumb grip on the forearm and it seems to be GTG. It's now pretty easy to keep everything in the A zone with multiple taps from 10 - 15 Yds.
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