One thing not mentioned thus far that may possibly help or improve things for you (if there is a flinch issue) is to go back to basics and make sure you wear some good ear plugs or muffs.
It has been proven (even with seasoned shooters) that this can improve accuracy.
I have good results when shooting off a bench or other rests by making a point of not restraining the rifle at all,,,, forward of the pistol grip.
Simply hold the pistol grip (even if with a two handed grip) and let the rifle buck and or swing and do its thing.
Might sound crazy, but it works for me.
The same technique can also be utilized when using a bipod.
In fact, with some f/arms having a good tight restrictive grip is actually counter productive,,,, and I can't help wondering if this is what you may be experiencing.
Can't hurt to give it a go,,,,,,,,,,,
I do not fear death itself... Only its inopportune timing!
I've come to realize that,,,,, the two most loving, loyal, and trustworthy females in my entire life were both canines.