Mike,
To be REALLY anal, but possibly of some help. You should only lose 18 yds.
example.. If the tee is 10 paces deep. YOUR middle is 5 paces from the front (half of 10). If I take off 2 paces, making it 8 deep, THEN find the NEW middle, it is 4 paces from the front (half of eight). Atmost a loss of 1 pace per hole.
I disagree with what the raters told you. There isn't any rule that says you MUST hit from the short grass on the tee. Only from within 2 club lengths from behind the markers. Their logic for moving the center up would also apply to the common practice of never placing the markers on the very front edge.
Does the offset from the front makeup for the offset from the back? What about if the teeing ground is not level? Do they adjust for that as well? :-/
What do the folks in South Carolina do? Their "design" foot is not a foot but a "factored" foot that varies in length depending on your distance from the "origin." Now you've got to have "factored" paces from the back of the tee.
I think I would make a great official of some kind. I'm just too good at being a twit, and its all going to waste. What a shame...