Have you tried any other pellets??? Whenever I get a new rifle I usually do grouping tests with every pellet type I have then I'll sight the rifle in for the best performing pellet. Also,,,, the more you shoot the rifle the more you'll get used to it and hence accuracy normally improves. You can also try different "holds" while shooting the rifle and see if there's any improvement in accuracy, although it sounds like you're already doing OK with that shooter

Oh, BTW,,,, I forgot to welcome you to GTA
You're gonna love it here,,,, lotsa nice folks.
Will be looking forward to your future posts......

Jeff