SO MANY NITROUS QUESTIONS

I have a 96 stang automatic with zex wet nitrous, bbk underdrive pulleys, hpm lowers, ford racing 4:10s, k&n fipk, 75 mm tb, trick flow plenum, x-pipe, flowmasters, hypertech tune. I have some questions about the nitrous. Will running 110 octane help with nitrous? Will not purging make my engine pop or is it something else? I'm still runnin stock fuel pump but I have a BBK 225lph pump that i still need to put in. And I'm only running a 75 shot.  and no i'm not running the programmer at the same time as the nitrous. Can I leave the nitrous on the whole time i'm racing or do i have to shut it off after a few seconds like on the video games. Oh and whats with the plugs? I bought colder plugs that cost almost 10 bucks a plug(at least they said they were colder). Am I supposed to only use colder plugs at the track? Cause I run them every day all day. Its my daily driver. Saleen body kit, cobra wheels, lowered.  Please help! Galimi? anyone!