I had the same problem with my Knight Wolverine II when I first took it to the range. Very frustrating! First ML & thought there was something wrong with it, until I saw a guy with a Remington with the same problem.
I use the Knight pre-soaked patches between each shot on the range, followed by two dry patches, & let the gun stand for about 5 minutes. You guys are right on about the short strokes, & the T handle.
I found that sabots were so hard to load, as well, so tried the Powerbelt bullets (.295 shoot best in mine, euro tip or hollow point doesn't seem to matter.) & loved them. I can shoot 3 or 4 between swabbing if I want to, where as the sabots are so tight I couldn't.
Just a note: I don't use any bore butter or such stuff. Knight recommends against it. When I clean the bore after shooting, I simply use the pre-soaked patches, then oil it like all my guns. 3 years & no rust as of yet.