Service HELP!!!!

Unintended consequences for the well intended. Maybe they offer too low a resistance or maybe the gap was not properly done.
Replace them them with stock plugs. As said before..maybe you screwed up some or one of the contacts. Redo the connections with dielectric grease.
If your bike is stock compression, cam and has had no high performance work done, why would you want to change the plugs to something different than the Triumph company engineers thought were the best for the bike?
Welcome to the Forum!!

My hesitation started before I changed to Iridium because it was acting up. I have been under my tank a few times adding LED Lights. I think you guys are on to something with the coil wires.