Suspension Problems!!!!
You shouldn't have to go with that design in the first place. A set that doesn't use cross bracing should be fine. Check out the SLP SFCs.
SFCs will help the body flex and are highly recommended.
For the wheel hop you will want an aftermarket torque arm. Search the archives for product recommendations there.
The next step for traction would be lower control arms (LCAs) and LCA relocation brackets (these increase your antisquat which helps a lot in terms of traction).

