I like the top 8 host the bottom 8. And I don't see why that has to be best-of-3. Keep the tournament as single elimination.
(The only way I would accept AQ's all host in the scenario where 8 teams host first round, is if the politics require it. ... The CCHA and AHA would likely vote for it.)
I agree with your comments on other scenarios, all of which have obvious disadvantage.
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If the topic expands to Frozen Four, I'd like ticket allocations to particpating schools to double, or more. Much better atmosphere, in person and on TV.