I think the superkart should be a bit wider and less bouncy - it should have about the same bounciness as the hotrod speedkart because that particular kart glitches less than the others and has the smoothest landings
right now the superkart loses traction for about a second when you begin to go up a ramp and about 2 seconds on short jump landings, similar to the speedkart 64 (it depends how you land but this is how it usually is for me). when you don't have traction, you lose speed and can't turn. the hotrod speedkart actually gains speed from ramps if you land correctly, which I think is really awesome
combining the superkart's looks and the hotrod's suspension would result in pure radness