I need some hook

Just can't get this thing to hook well. With the previous combo and 3.55's it was no big deal, 12.4's at altitude was pretty damn consistent.
This years best run so far:Base elevation 4,000ft - DA during run 7859ft
60ft - 1.599 330ft - 4.74 1/8 - [email protected] 1000 - 9.753 1/4 - 11.725 @ 114.15
All my runs I basically have to hit about half throttle and roll into it. Or the thing basically insta spins. The best run the track was still decent before the street tire cars chewed it up, I was able to 3/4(ish) throttle launch, but in the video you can see the car nose real fast. Not sure what caused that, very well could have been me, but it was also the best 60ft this car has done yet.

Specs:
408
Dynamic converter 4500ish stall
904 MVB
4.30 gears
255/60/15 MT ET Street R's (25psi all runs)
Cal trac mono leafs w/ bars set in top hole w/ 1 flat of preload (so far this seems to work the best)
Rear shocks are Rancho 9000's set at 7 (cheap and semi adjustable, worked WAY better than the old CE 3 ways)
Front shocks CE 3 ways set at 90/10
QA1 upper and lower control arms
stock 318 torsion bars
Here is the best launch (1500rpm 3/4 throttle

Here is the full throttle launch (loaded converter 2500) Don't mind the ET, it spun and I hit the limiter in both shifts.


I can see 2 obvious things that I could change. 1. try a real slick 2. better shocks (too pricey for me at the moment)
What do you guys think? Anything you would try before swapping to a 28x9 slick? Or dumping a buttload of cash into fully adjustable shocks?