T-bars vs Stored energy

Is it not moving fast enough or too fast?

340 are the wrong direction in almost every case on a drag car.

If it's moving too fast, control it with a good adjustable shock. If too slow, you need to loosen up the front.

Hook and spin is a loading and unloading situation which also may directly related to proper shock control of your suspension. Tire pressure, ride height and a bunch of stuff can be the cause. Lots of times it's in the front of the car, which you appear to be addressing.

Watched video, looks like shocks are still too short... With the rear hanging, how much extra extension do you have? If it's not at least 2" get a longer set of shocks

Tires? If drag radials, put more air in them. I run 275/60 DR's at 20-24#. People think it's crazy, cars hook hard.