I agree with an8sec70cuda here: Front shocks and front suspension is too loose/too fast in both planes.
Car tries to carry the front and certainly has the power, she seems to grip at the hit but- the front "bounces up, then drops down".
When coming down, it comes down too fast and, to far, when the car pivots forward on the front- rear is unloaded.
Granted it started to slip/spin at apex of front coming up.
Think of a piston at the top of the stroke- for a microsecond- it stops.
Same with the front end travel, it stops moving up and immediately starts down and that movement changes weight transfer.
We are working on one here with the same issues.
adjustable bump stops or travel limiters can help some but you really, really need adjustible shocks and- a set of dang scales.
If i could i would ship you a set to set up with.
Why?

lets say you car is on scales and this is what they say:

Lf- 946 RF- 796
LR-756 RR-848

car is left front, right rear heavy- really not good.
A QUARTER TO HALF TURN ON A TORSION BAR will pretty well level out the weight bias on the car.
the point is- it only takes a tiny bit of torsion bar misadjustment to have car unhappy.

Hope this helps.