Is it just the nose that's dragging?
If so, maybe it's mounted incorrectly (ie too low or too far forward on the kart.)
Raise the body up if it's just the nose dragging the track.
We mounted one particular body for a customer with the nose on top of the frame rails -- it took a lot of cutting with a Dremel to fit the front bumper through the nose, but it kept it out of the rough race track he was running on.
A narrower LF wheel would help slightly as well.
It's easy enough to stretch Burris tires -- keeping them to size can be a challenge though.

If you're at 33" on the LF and it's still dragging, there's like something wrong/bent with your chassis.
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Brian Carlson
Carlson Racing Engines
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