I almost exclusively drive the NSX and the Gr3 car still bites me from time to time. The more you drive it, the more you will learn it's characteristics. It's a fickle beast. A few things were already mentioned above, but a some tips that can help are:
- If your rears are more worn than the fronts, it's already too late
- Manage throttle inputs. Avoid wheelspin
- Don't unsettle the weight balance of the car with quick movements. In a left-right or right-left transitioning corner, you have to ease the car from side to side rather than throwing it the other direction. Also don't quickly jump off of the brakes thru a corner. This will also unsettle the balance.
- Try staying in one gear higher during entry. For example, if it's a 2nd gear corner but your rear is unstable, try entering in 3rd gear, then shift down to 2nd at the exit
- For some reason, a 5% throttle input while braking and turning actually helps keep it settled on entry. Not sure why, but it seems to help
There's a lot of little nuances with mid engine cars in general that are tricky. You really just need to drive them a lot to get comfortable. Hope this helps