XRAY - Model racing cars

I have heard people refer to a problem called diffing out and I think I am getting it. When going into a tight corner then getting on the power it seems like the rear is rolling to the point where the inside wheel lifts and spins causing the rear to be loose.

How would I prevent this? I am quite stiff in the rear 2.7 with hole 3 from the inside and a high roll centre.

Thanks

Are your downstops allowing the car to roll?
The downstops could be too low and when the chassis rolls the inside wheel is lifting.

4.2 at the rear

Thicker rear diff oil

That all looks normal. Thicken up the oil like Skiddins recommended.

Thanks 2k 3k or even more

Its quite low

Try 2k then and see how that goes.