Need a little help please.

I have a new idm .12 3port and breakin is finished and running well. On inspection of the plug the coils are shiny but are distorted a little. not in the too high compression/too hot pushed in way but kinda pulling out of the plug body a little bit. I had read on another thread this could be from a pipe that is moving too much air? I am using 7mm zac pipe. could this be my problem and if so can i put a 5.2 mm restrictor on the stinger or will that cause more problems?

Thanks for your help.