You aren't telling me anything new here, I've been on the leading edge of the stacked set-ups and have been working on motors over twice as long as you've been alive. I appreciate your concern but I seldom run WOT anymore, I AM an old fart ya know. I do have a wideband and all has been well but I know it's better to have a lower duty cycle than I do, although I have no means of measuring that right now, purely speculation on my part. Hope there are still Crossfires to play with when you are my age.