T-bars vs Stored energy

IMO, Pinion snubber = door stop to let a breeze in the garage. I never use them, EVER. If the rear springs are good, clamped, it's an unnecessary item, a crutch. Low 10 and hi 9 second leaf spring A body cars... no pinion snubber in sight! :) You got your own data about whether they work.

The Calvert rear shocks are good. Make darn sure there is enough extension. Try to get video from the side concentrated on your rear tire. In almost every case with leaf sprung mopars, a car hopping like yours has too short of a shock on it and it can't control the rear axle movement. This is also where the importance of clamping the crap out of your front segments.

The rate of torsion bars thing. Another visual of the concept. Two springs, each 12 inch in height. One has a 100Lb rate, another with a 50lb rate. Take 100 lbs and set it on top of each. The 50lb spring will now be at 6" height, the 100 still at 12". What reaction would each spring have if the weight was knocked off? One is going to fly from the stored energy, the other, not so much... Same with putting a higher rate bar in your drag car. You want a bar that requires a lot of preload to sustain ride height.

If you can, cut the upper and lower bumps tops 3/8", drop the front down and set the ride height so the adjuster has just enough preload to stay in place at full extension, try it there. It may be in the weeds, but it should have around 5+ inches of travel. Front end travel is your friend!

There are a lot of ways to skin a cat. It's all about finding the approach that works best for you.