Try RL-19 and the 150 TTSX. I have the Montana version. You can see a couple of the groups from one of my earlier posts. Way better than what you're getting now, I think. You haven't found your optimum combo yet.
Some disagree, but I had to work on my form a bit to get top accuracy from my Montana. At first, I felt like it was exposing all my bad habits at the bench. Lightening the trigger also helped.
