As of now, I moved the upper link to the outside hole in the rear. Moved the ackerman (sp?) forward. Went to full droop in the front to increase weight transfer. Turned the pistons taper down. Made minor right height changes in the rear to induce more pack and in the front to increase weight transfer to the rear while on-throttle.
I think that's it. The biggest problem is that I've only had two short practice sessions since I've built the car. Rain has really been killing us down here. The next thing I intend to do is put X6 hubs on the rear to use the lower hinge pin hole.
Car lacks rear side-bite on-power/corner exit. I've made one change at a time and each of those listed seems to have made an improvement. I was just thinking that, since this car was designed to have so much of it's weight pushed forward, why not bring some back a bit.
When you get a chance try the following, all of which increases rear traction. You should try each setting one at a time.
1. THE RIGHT TIRE !
2. Softer swaybar
3. More rear toe in
4. Longer upper camber-links
5. Shorter wheelbase
6. Softer spring and/or lighter shock oil
7. More rear droop ( has a better effect on overall rear traction than increasing front droop)
8. Lighter rear diff oil....
What is your engine and clutch setup ?
Trying one or more of these settings in combination should solve, or at the very least alleviate the loose rear end. Also, keep in mind what Chad said a few pages back that the car will be loose when it's new and needs a small break in period.