i ran my car on 1.1mm iridiums at pretty much the same boost
used to get a slight miss, which got a bit worse when it got colder
i taped up the coil packs so they wouldn't arc, and it seemed to work
eventually i just replaced the coil packs with brand new splitfires, worked a treat after that
even ran ok pulling ~1bar at 1.1mm, though i'm planning on running more with my new turbo and shit