TNHagiesWhile the TC plugs do shoot with out misfires I do modify them, first if the flame channel is modified by enlarging with a #21 drill they the carbon builds up about 80% slower. Then while they are not near as soft as a CVA plug they do Flame cut after a couple of cases of BH is burn in them using heavy loads so the comes the Lehigh vent liner [ I used to make my own but the Lehigh heat treat is much better].
In conclusion you get what you pay for, and I have yet to find one I could not improve on.