I own three of the LK series rifles. One is a LK-II and the other two are LK-93. One is stainless and one is blued. All of mine have the 22 inch barrels. And they have the #11 ignition.
What I would do is get rid of the pellets. And personally I like the #11 ignition. I would never change that. My rifles shoot best with 85 grains of loose powder. It likes the 250 grain Barnes Expanders, 250 grain XTP, and Shockwaves in 250 grain.
I would get a pound of Pyrodex RS and some 250 grain Shockwaves. Try shooting 85 grains of loose Pyrodex RS and some of them Shockwaves. See how well they do.
this is what my LK will do at 50 yards with the one power scope. I was testing some of the 300 grain Speer Deep Curl bullets.