[Just Plain Crazy]

I mean off set the engine by loosening the mounting bolts and turn the motor 7 to 12 degrees to the left or right this will give you more use of the drive clutch and the driven clutch. I don't think the tires are the problem ( 22" rims) It sounds like a clutch problem but which one is going to be hard to figure out. I'll ask around and get back to you.
JPC