Try a standing height bench rest. You mention that you are shooting of your bench...sounds like you own a bench and maybe the space to shoot as well. If so a standing height bench should be in your future.

The standing bench I often shoot from, at my almost local gunsmith's, is height adjustable from sitting to standing and the pipe legs easily extended to a height that allows for shooting while standing. Recoil sensation is a small fraction of sitting bench recoil and accuracy is excellent if your bench is sturdy enough to lean into.

BTW, this is how the rifle was regulated, more than likely.

JPK