you should be able to run that epap at 24" without burning or bleaching. the gavita has a hot spot at 24" dead center.
24" Gavita or 24" Epap is very very (did I say very?) close imo. Last grow I tried to keep the Epap 33-36". Pretty sure your growing toast if you run 1000w at 24" with one of those.
I'm going to either lower the fixture a bit or increase the wattage this week.