XRAY - Model racing cars

Sounds too me like you are on the right lines, but if what it sounds like you need is a little less grip !

Hole 3 is that inclined /
Or vetical |

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I would say try a harder spring but seems that you already have quite hard springs!

What you are trying to acheive is impossible ? Its common for people to want to go faster round corners without loosing grip, but trust me i think you want some movement.

What will help the most is for someone to actually watch your car as you race and see what is tripping over what. It is most likely the front and yes a front roll bar will help but you could over shoot the apex understeer to far forward and get a poor exit.

You are better off trying to keep the balance of the car the same. Try the front roll bar on soft and raise the spring rate in the rear to light blue or blue.

As qwiglee said front roll bar gives rear end grip and vice versa. A common carpet racing thing is to use thicker oil. Double check and double check again your ride height. You may need to lower it.

What sort of turn in do you have, what sort of corner exit do you have. More info you can give etc etc...