Hi Chris,
Here are a few things i'd try.
- Short wheelbase - if you are running RB5 rear wishbones (which will help by themselves) flip them over, this ill reduce wheel base by 3.5mm ish. I run on long wheelbase (1.5mm shorter than normal short) when the wishbones are flipped. It's rare i do this but i did run it like that at the Kidderminster national as it is super slippy there.
- have you drilled the extra inside hole on the RB5 rear arm? This will help drive but also get the car into the turn quicker. I run this position pretty much everywhere.
- lowering the inner links front and back will help. I tend to vary between 2mm and 4mm on the front (4mm - high grip). On the rear I change between 2mm and 0 (0 on low grip).
- Shift weigh back - although for me if you loose to much steering you find yourself trying to force oversteer with the throttle, which can be counter-productive.
- More rear droop should settle the car down whatever the condition, I tend not to touch this much at all and i run a fair amount.
I hope some of that helps
Kev