You used cleaning felts to clean only?
i would try a good clean with a napier pull through kit, then about 50 pellets to re-line.
I find the cleaning felts only good for taking "some" of the dirt out.
Try sizing the water Express (What batch express) pellets to 4.49. That should produce tight groups.
Seen Walters that will group "one hole" at 55 yards with such a set up.
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