Originally Posted by Barry_Hughes

trying to find the post relating to this, but with 700 cst the car actually rotates a lot quicker and the rear is loose, with 2000cst the car actually powers out of the mid & exit of the corner better, which as I understand is your problem.

look at the vat majority of set ups at most tracks and the rear diff oil is around 2000 cst.

I had a similar problem to you when I first ran my T4 indoors on a large carpet track. Changed to 2000cst rear diff oil and it was far, far better.
The description of oil changes in the instructions is actually misleading.

Seriously try putting in 2000cst oil.