I think the problem with flex scheduling is that it may be beneficial to the East but it is completely unnecessary in the West. The two division alignment works perfectly in the west and there are no significant rivalries that would be split up by having a PTZ/MTZ division and a CTZ division with the possible exception of WIN and VAN/CAL/EDM.
Valid point, Bucky. I ran into that in my own experimenting with the idea. I really do like KevFu's idea of flex-scheduling, but it could ultimately be problematic in the West. Flex-Divisions, however, can work in both the East and West, and can fix at least some of the Divisional alignment imperfections that comes with whatever alignment one conceives of.
Unless you create a Division that's completely a 'circle', there are always Division outliers, and those teams can easily be linked to a neighboring Division. A team at the heart of the Division essentially has the Division as it would want, or at least the Division that can be reasonably justified for it to be in. Therefore, the team at the heart of the Division would not be part of the flex-arrangement. Flex-Divisions also pretty much depends on there being a secondary group of teams that have an intermediate level of games scheduled against them, with respect to the teams inside the Division (the opposite extreme In-Division opponent being one of those 4 or 5 teams)...
6 x 4
4 x 5 (or 4 if kept at 82 games)
2 x 20
Using the West as an example:
PACIFIC (Option 1)
Vancouver (4 games against Phoenix, 6 games against either Calgary or Edmonton)
San Jose
Los Angeles
Anaheim
Phoenix (4 games against Vancouver, 6 games against Dallas)
Another version of the PACIFIC (Options 2) could be...
Edmonton (4 games against Anaheim, 6 games against Calgary)
Vancouver
San Jose
Los Angeles
Anaheim (4 games against Edmonton, 6 games against Phoenix)
NORTHWEST (sticking with Option 1, for example)
Calgary (4 games against Minnesota, 6 games against Vancouver)
Edmonton
Winnipeg
Colorado
Minnesota (4 games against Calgary, 6 games against Detroit)
CENTRAL
Detroit (4 games against Dallas, 6 games against Minnesota)
Columbus
Chicago
St Louis
Dallas (4 games against Detroit, 6 games against Phoenix)