I would have posted the weeks used but I cannot access my spreadsheet right now. I will post on Monday. I did not use an average.
I think the MHB 1BR is odd as well. I just checked it to make sure and I get the same discount whether it is a 7/3/15 Platinum check-in or 5/9/15 Gold check-in. Does it mean they will be a tie on a request? Maybe, maybe not. Logically July should be higher but there are certainly plenty of people wanting to go to Branson in May and its not the same type of people that want to go in July. 2/28/15 Silver on the other hand is not even close and seems to be at the bottom of the barrel. This makes sense.
I know for almost all the units I used either Week 51/52, 7, 26/27, or 47. Initially I thought week 7 was better in places like MBP and MGV but weeks 51/52 were better by a sizable margin.
Also it is worth noting that the differences are not based on week to week but more of a range of weeks. Weeks 51/52 are probably an exception but in order to test the range one would have to test each week. I am not quite that motivated.
With this method one could also test the drop in trading power as it gets closer to check-in. I am convinced that trading power doesn't drop until at least 6 months prior to check-in.