I'd back off the power a bit. 4895 is great for 308s but I don't think you need 44 grns. Back off to 41.5 and see what happens.
Try Fed Match Primers, they work great in my 308s.
Also don't be so picky on cleaning the thing. Shoot a few dozen rounds or so without cleaning and see what it does to your groups.
Just do one thing at a time and record the results.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071