XB4 2wd Setup Advice Wanted

[Alan - South West RC]

Ran my new XB4 for the first time the weekend and ran it in 2wd as that was the only class running. The car was very good and I was pleased with how it ran but I am after a little setup advice. The car was a bit loose on the rear end under acceleration and I was wondering what changes I could make to try to reduce this. The track was a combination of Astro and Grass and was very dry and dusty in places where the grass had worn.

Setup Sheet