John I have built 4 Ultralites over the years and tell you for a fact yours is different than all the S2k models I have seen. Yours appears to be a hybrid of the S2k body and Xr7 chassis components. That being said I'm glad you are getting it set up to your liking.
I've raced my Ultralites for over 9 years and have pretty good success with them. In all types of venues Auto X, Road Racing, drag racing, touring and One lap of America 3 times and thousands of road miles covered too. It took a few adjustments to get it dialed in. The biggest improvement I feel was upgrading the shocks to a set of Advanced Racing shocks. The ride is much smoother and has much improved over the QA1 units that come with the kits. The QA1 units can be revalved for better results but its much easier to turn a knob on the Advanced Racing units.
John curious what tire pressures you are running on your car? I have found tire pressures can really make huge difference in handeling characteristics. It can vary from brand to brand as well.