Eddie-you may want someone to walk through each aspect of your car to determine where the ‘drag’ was that was slowing you down. With minimal tuning your car should be turning 4.1-3.9s easy.
Slot.It tires are Non-Spec – I have some ThunderSlots if you need a pair.
You cannot change the guide, but about 3gm of weight and a 1mm spacer may help prevent the flips and rolls in the tight corners. You may need spacers on the front posts – see previous posts about flexing the front axle carriers when they press against the body.
Other flips and rolls are just you getting use to the braking spots in the corners.
"... get on your bad motor scooter and ride!"
Sammy with Montrose