Interesting to hear a TBL fan say that, since they are one of the teams I figured would hate my 3-conference idea, which emulates the COVID Central Division (though I came up with the idea long before the 2021 season). It goes like this:
Pacific Conference: ANA, ARZ, CGY, COL, EDM, LAK, SJS, SEA, VAN, VGK (10 teams)
Central Conference: CAR, CHI, CBJ, DAL, DET, FLA, MIN, NSH, STL, TBL, WPG (11 teams)
Eastern Conference: BOS, BUF, MTL, NJD, NYI, NYR, OTT, PHI, PIT, TOR, WSH (11 teams)
Schedule for this setup is super easy: each 11-team conference plays 4 games x 10 conference opponents (40), and 2 x 21 non-conference opponents (42) for 82 games. Pacific just has a 5th game (one home, one away) vs 2 of their conference rivals to balance out.
The playoff format would make all the odds equal by having the top 3 Pacific teams, and top 4 Central and Eastern teams get automatic spots, then the next 5 teams by record, as long as no conference exceeds 7 teams in the playoffs total, get the rest. This "range" makes it so that the odds are 3-7/10 (avg 5/10), and 4-7/11 (avg. 5.5/11) every year.
As for working out the uneven pool: you would only ever have these scenarios occur in this setup:
1. A 6/6/4 split, in which all the conferences would pair up teams within themselves, 1 v 6, 2 v 5, and 3 v 4
2. 2 odd conferences (5/5/6, or 7/3/6, or 7/4/5, etc...) which would result in 1 crossover series if it's Pacific/Central or Central/Eastern, or 2 crossovers if it's Pacific and Eastern that are odd-numbered (1 PAC/CEN and 1 CEN/EAST, to minimize time zone travel)
And finally, to prevent the Eastern time-zone teams in the Central conference (DET, CBJ, TBL, FLA, CAR) from having to play crossover series vs Pacific in the 1st 2 rounds, you simply make it so that only the Central time-zone teams (WPG, MIN, CHI, NSH, STL, DAL) are eligible for those crossovers, and same goes for those teams in Eastern Conference crossovers (only the former teams do that). With a 6-5 split in the Central conference on which teams come from which time zones, you would almost always prevent the bad crossovers, unless there are 0 teams from one time zone, which would be rare.
I have some examples if you're curious:
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