Plug gap recommendation

I have the NGK BR7EF plugs for the bottle and need to know what gap to run for a 100, 150, and 200 shot. I run the NGK TR6 on motor at .040

For a 100-150, its fairly common to gap them at .035. Not sure how much it has to tighten up for a larger shot. I would probably set it at ariund .035, and run it. If it starts missing or breaking up, try tightening the gap a little as the nitrous is apparently preventing a solid spark.