Need some Suspension Advice Please....

Aren't burnouts tire dependent. Do a big smoker with a drag radial and they sometimes get greasy.

Put as much air pressure in the tire where it 60's the best.

If it's porpoising, IMO, you likely need a better shock package.

The front end has a BIG effect on what the rear does.

IMO, throw the snubber in the trash... it's a band aid for a bad set of SS springs. When I ran SS springs NONE of my cars ever had one, it's not needed if the front/rear segments are set up properly. It can actually cause more problems than it's intended to solve.