Street car on the track - newbie questions

Will soon be attending a car show/bracket race event with my demon. Was at the same event last year but let my uncle drive the car.

I run BFG 275/60R15 on the rear. Is it safe/smart to drop the pressure for the trips down the strip? It spun quite a bit last year but we lowered pressure each time until finally we were around 17lb and it launched much better.

Also, water burnout? No burnout?

Sorry for the possibly obvious questions, just looking for some opinions. Thanks.