Interesting... the stock setup is the starting point for most of us. It's both smooth and fast (although it could use a bit more turn-in in some cases I find). The car does feel great box-stock, at least rubber on carpet (dunno foams, sorry).

May I respectfully suggest you thoroughly check the mechanical integrity of your car and the assembly overall (nothing binding, everything symmetric, electronics setup properly with no crazy non-linearities, ...)? Although, given your sign-up date (you're an old fart like me it seems) I would tend to think you know how to build a car by now

I honestly believe xray's bone-stock setups are the best of the market... that's a big part of the xray appeal in my books: carefully build it bone-stock and you've got a weapon... so the above comes as a surprise...