I didn't like the front swaybar on my Hyper TT on any kind of surface (loose outdoor or high-bit indoor clay), I recommend getting rid of it.
After doing a lot of testing with different diff fluids, I liked 10k/40k/7k diff fluids on high-bite indoor clay and 15k/80k/15k on outdoor, loose dirt when running a fairly fast SMC 4500kv 4-pole motor.
Indoor clay setup tips:
Outdoor loose dirt setup tips: