I don't think you or I will ever put the rounds through one gun the way Bridges did, nor we build the pressures that he was building, but the fact that pressure cutting is possible is a concern.

I am certainly not a muzzleloading engineer, but my conversations with Remington and Austin Halleck factory people have lead me to beleive the gun is designed so that the face of the BP should seal against the rear face/flange of the barrel just after the threads. If you can get the gasses stopped at this bearing point what happens back in the threads of the breech plug are not a concern and of course seizing would not occur at all - rust and primer/cap contamination yes. If there is a gas escape backwards it is, or at least it seems possible, for these pressure cuts could occur.

It is my belief that the plug must be sealed on both ends. The business end as well as the primer/cap end. Again the way I wrap my plugs I do overlap both ends of the plug.
I am using the TC tape because it is thicker and seems more resistant to heat. I know longer use an anti seize lubricant at all, although I did at first. By taping the face of the plug with TC tape I do not have to worry about contamination of the powder and the tape at the rear prevents primer contamination.

Cayugad, I am still a firm believer of your theory "if it isn't broke don't fix it" so if you you are happy don't change, my concern only lies with the safety aspect when we might allow undo pressure back into an area/space that that is not designed to take the pressure. My other concern would be the microscopic movement back and forth and the contraction/expansion of a somewhat loose Breech Plug. Two prime ingrediants of metal fatigue. All of this is not something you can see or measure only the results after it has happened.

Best of luck during hunting season, may it last til your winter is over....