Excellent advice Warp.
I forgot one thing: pull the stock tightly into your shoulder (with your forend grip) so it has no intentional give when it fires - not stressed, just "tightly comfortable" while exhaling during the pull. That solved trigger variances for me, but that shoulder "lean in" seems more like a golf-swing-style muscle memory exercise per Warp's suggested solve with variant loads.
I forgot one thing: pull the stock tightly into your shoulder (with your forend grip) so it has no intentional give when it fires - not stressed, just "tightly comfortable" while exhaling during the pull. That solved trigger variances for me, but that shoulder "lean in" seems more like a golf-swing-style muscle memory exercise per Warp's suggested solve with variant loads.