Only -1度油壓托 is ok now, because 3racing have difference spring sets. 5.5 spring is good!!!!
If you want more stable,
1. must be rear 3" toe in
2. check your down stop....If your car ride high is front 5mm rear 5.5mm, down stop may start from front 4.5mm and rear 3mm measure at A arm.
3. This car is better have wider rear wheel base than front, e.g front is 185mm rear is 189mm.
4. drive belt also important..........can not too tight. I think loose one more hole, the car will run more smooth.
5. The car more turn is better than less