The AX chairs did a great job of maximizing the laps on Sunday.

Over the last 3 years I don't recall another AX where we got 15 laps. All of the problems Tom mentions makes it hard to tack on extra laps at the end and it is difficult to add on laps too early because there are usually various problems that crop up during the day that have to be dealt with and cause delays-- and this is just a guess-- but I suspect there might be some comments if some laps had to be cut half way through the second practice session and some run groups didn't get the same amount of track time
Sundays AX may have caused a bit of a false impression. There was a relatively low turnout. The AX chairs started an hour earlier than has been the case in the past. Bill Behun went out earlier in the week and checked his track layout, avoiding problem areas and expediting the layout on Sunday. The generator started. There were ropers, lots of tech volunteers, the corner working talk didn't go on and on

, etc. etc. It was the smoothest running AX in a while due to some hard work and good luck (no disparagement of past efforts intended).
But I do like the idea of some extra laps!