RE: PR QT .40 235 gr
PR's bullets usually provide excellent accuracy, as long as they are matched well to the gun. And that may be the problem. You would probably get better results with the .45cal QT in the 300gr range.
Your powder could also be the culprit. I love the CleanShot loose powder, but I've heard a lot of complaints about the pellets and their inconsistancies. If you can, try some loose powder with your 235's and see what happens. I would start shooting groups of 3 with 80gr of powder and work up in 5gr increments. My Knight is sighted in with 348gr Power Belts with 110gr of loose Cleanshot, and each change of 50grs of bullet weight necessitates a 10 to 15gr change in powder charge. So in order to shoot your 235 out of my gun, I would have to drop back to around 70gr of powder & fine tune from there.
Personally, I think the larger bullet will solve the trouble faster than dropping the powder charge.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!