Well, I am still running that frame, and over the weekend we realized part (most) of the issue was the frame. With 3 different engines, each with their own carb, and a different clutch on each, I was at best 500 RPM down on the rest of the field. I had absolutely no top end and struggled with it all weekend.
Along with that, if the chassis wasn't straight before the weekend, it certainly wasn't straight after! Saturday pre-final I got caught on the outside of someone trying 3 wide, and that punched me off the track. Then on Sunday's pre-final at the start some kid tried forcing me off the track, and we caught wheels as I was on the brakes avoiding him lifting my kart nose up momentarily, and on the last lap of that race I got drilled directly off the track after one of the most optimistic pass attempts I'd seen while on track all weekend.
When we put the kart on the ground, it was 4x easier to lift the inside rear when full-lock turning right vs. left, so off to the table it is to straighten this frame for the second time this year! My dad is really trying to push this frame to the end of the year and it's absolutely killing me