Well supposedly a symptom of the ignition inside the tip is that there is significantly more heat transfer to the torch and the torch becomes hot to hold, and also flashbacks up the lines become a possibility. Do you guys use flashback arrestors at the torch end or the bottle end?

If either of you haven't experienced this, then I'd wager that this is a case of best practice is to to do X so as to avoid a 1 in a million chance of Y, i.e. it is not that much of an issue and I'll stop worrying about it LOL. Or maybe that this only becomes problematic if the tip is significantly under-fed. In any case, a Newbie such as myself does not know which rules are written in blood and which are just general guidelines so it is safer to rigidly stick to the rules until informed otherwise. I'd love to hear Doug Fattic 's opinion too if and when he has the time. I'll post another video after some more practice in the coming weeks.