Need some Suspension Advice Please....

Let us know what you find out.

Btw, is this a new problem or has the car worked ok until the most recent outing? 50/50 for a rear setting is ok. Stiffer, like 7-8 on a rancho also a good place to start.

The spring clamping is also a good recommendation so you can change the spring frequency. Adding a little weight to the front will do the same.

Good luck.