[mahout]

Some comments:
For competition you do not want a car that is unspinable. Rotation of the car is absolutely necessary for quickness. I don't recommend you remove the front bar, just disconnect it by removing the shock to bar link on the driver's side. Takes only 4 or 5 mm spinner and 12 mm or 14 mm open end wrenches. 5 minute work. Additional understeer from more front antisway means the inside tire unloads quicker so you have less cornering power. All you're doing is grinding off tire rubber as you crank the steering wheel further into the corner - and going slow. Louder noise is not an indication of speed.
When you do it correctly you can hit a late apex and power out; with lots of understeer you just slow down going in and never gain coming out of the corner. Body roll is not the enemy; traction is. You can get away with very stiff springs all around, making it a go-kart but then its just a competition car.
Without seeing the course its hard to tell how your times and competitors are but 2 seconds in 40 sounds like a lot.
cheers.