Got told this?Dropping the chassis loses grip (so moving the bolts to the top holes)
Raising the chassis increases grip (moving bolts to bottom hole)
Rear bearings with collars on outside will generate more grip
Rear bearings collars in less grip
Front wheels out more grip
Front wheels in less grip
Rear wheels in more grip
Rear wheels out less grip
To get more grip at Rear just leave the kart in the standard ride height and move the rear wheels in 5mm each side from the circuit.
Shouldn't need to change ride height I wouldn't have thought.
Nick, you should drop Alan Hoyle a line. He's in Boston and if you did a few days at the track.with him you would learn loads and save trying things that may not be correct. He knows cadets karts like the back of his hand and helps new starters get a springboard into cadet racing
Tyre pressures should be around 24/26psi
Top holes on rear bearing hanger
Plastic rear bumper or Metal loose
Rear track width is -10mm either end
Front 5mm on outside of wheel.