Get my car to launch better...

The pinion angle looks acceptable. The harder you are hitting the spring, th more it need to be rolled down. Looks like a 4.5-5 down situation.

People cheap out on shocks and torque converters. Do yourself a favor and buy a decent adjustable shock. You don't need to go full kill, double adjustable. The Rancho 9 ways are good, QA-1's something that will dampen worth a darn. If the car leaves the line and porpoises, you don't have a good or at the least a mal-adjusted shock on the car.

I'd do your burnout in 3rd gear. You need about 80-90 mph tire speed to get them heated up well.