I talked to a old guy at Turbo Action Convertor years ago. I told him what the combo was and what I was doing with the car as in bracket style racing.Thats all we had for racing back then. I thought I needed a 5800 stall convertor (mostly for the wow factor). Well he asked me one question. How thick was my wallet? I had a very small budgit so from his recommendation I had a new 4800 converter. I been racing for awhile and the car is deadly and very little breakage. I leave at 3800 and the car will flash the converter at 4800. The 60' times are 1.42. Tested it couple times at 4600 and all the differance was .002 off the 60' time. Alot harder hit and I could see breaking things at that rpm.
What I see from the vidio is you turn the wheel at the launch. The car is not wheel standing its poping the wheels up mabe 6". If it was me I would launch at 800 below the converter stall and work on the car from there. I bet money you will end up faster.