Mark,
This years sequences were designed by the board based on the CIVA and IAC sequences. They were changed and modified based on the feedback from the membership. The final sequence decisions where made by Officer vote, Officer voting on the tail slide was 5 to 3 in favor. Of the three current IMAC board members who fly Unlimited, two voted for the slide. Believe it or not, there were many Unlimited pilots who wanted the slide in the Known sequence. At least in the Knowns you practice the figure and if you do blow it there is the chance that sequence will be dropped. Where as in a Unknown, it's going to count no matter what happens, plus the figure was not practiced.
We shortly discussed eliminating the Tail Slide all together from IMAC, but we didn't want repeat the mistake of playing with the FAI catalog like we did a few years ago where we doubled the K on rollers and 1.5 times them for the Tail Slide.

Tom Wheeler
IMAC President