Fix the pinion angle, set the shocks on 50/50 in the back and 90/10 in the front and lose the snubber, then see how it does. Your springs may be your biggest problem though.
I agree, though it's been awhile, I normally do the whole car suspension in one shot. Theres a pinion angle kit (Shims) that go between the leaf springs and where they mount. They come in 1-2-3 degree angles. I've used nuts in a pinch before, but, I really don't recomend it for actual use much less drag racing.
Good run, nice all around, keep at it. This is where the fun begins!