Colder Plugs ?

Hey was wondering if anyone has had to go to a colder plug when running nitrious im working on a 1000 outlander and i know they take a 8E plug but i heard some ppl have to go to a colder plug like a 9E when running nitrous im having a hard time getting the nitrous working right on this bike and ive tried everything but changed to a colder plug, this is an on going problem i have been dealing with since last year its just beginning to start spring where i live and i wanna get this dialed in before our first rally ride, was wondering if it would take away from the bikes performance by running a colder plug all the time even when ur not spraying the bike … any input at all would be much appreciated thanks