I was running the powergrip hd which is the same sintered bronze puck arrangement on both sides of the clutch disc. It likes some rpm at low speeds and to get moving. I also ran the same disc you are running at about 600iish hp in my 3600lb 66 Charger with good results. You will likely wear out the sintered bronze sode pf the disc first becaise that is what slip at instances of higher RPM/tire plant.
I am a big fan of any type of hydraulic shock in place of anything gas charged.
Gas charged shocks SUCK. Just one guy's opinion : D
SA, DA, whatever as long as they are filled with oil instead of gas and adjustable. My GTS has DA's all around and until recently it was running the leaf springs it was born with, some Vikings in the front, QA1 in the rear. From memory my best 60' was a 1.64 on a 235/60/14 m&h (prepped track).
It would usually take me 8-10 hits on Friday t and t to dial the car in for a Sat-Sun no prep deal. Those events are a little more tricky.
The clutch tamer definitely made the car work on that tiny tire with the worlds world's harshest single disc street clutch and (3100 lb) pressure plate.
Probably the best thing you could do is add a nitrous kit. That extra power will really get it up on the tire : D
That and test, test, test. I could make 10+ passes on a t and t night if I had a test plan put together. It's good to make a list of intended changes before going to the track IMO. Stick to the script, take lots of notes.