First time out Results

Get your chassis problem sorted out before going to a high stall convertor because it will only magnify your current issues.

I would try a set of good shocks that are the correct length and a pinion snubber. Make sure the front of your springs have the clamps on them and cut the clamps off the rear. Also check your pinion angle. You can shim it if needed.

In regards to trap RPM, I don't know your engine but in my combo I'd run it though the traps in 2nd gear which would be about 6800rpm in your case. But if you can get to 60 foot better that may change. You could also try different shift points.