Thanks all.
So, in talking it over with my crew and other official friends, they were all of the opinion as Kalle. There is no specific requirement to go back to the previous spot on trys where there is a Team B foul.
8-3-3-b:
"Fouls by Team B on a try:
1. When the try is successful Team A shall have the option of declining the score and repeating the try after enforcement, or declining the penalty(ies) and accepting the score. Team A may accept the score with penalties for personal fouls and unsportsmanlike conduct fouls enforced on the succeeding kickoff or from the succeeding spot in extra periods (A.R. 3-2-3-VI; A.R. 8-3-2-II; A.R. 8-3-3-I; and A.R. 10-2-5-IX-XI).
2. A repeat of the down after a penalty against Team B may be from any point on or between the hash marks on or behind the yard line where the penalty leaves the ball. (A.R. 8-3-3-III) "
The key there is after enforcement. So, in this case, how would you enforce a facemask on a regular run? 15 yards from the end of the run, or, in our instance, 1/2 the distance to the goal from the succeeding spot.
So, there is where i made my mistake. I created a false equivalency between DOF an Facemask.
thanks for the help going through it.