I think any of those would be fine; I think even the slightly more difficult chart for the same track would be fine. I've just played a lot of rhythm games, so it would be difficult to make something too crazy. Having a range of difficulties would have been really cool, but totally makes sense to be a lower priority for a jam, where hardcore rhythm gamers are probably not gonna be a huge portion of your players.
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As a musician I know exactly where you’re coming from. I would personally love to have a wide range of tempos and difficulty options added to the game eventually. There are of course other ways to increase difficulty as in your example, so I guess pot-jam it’s about trial and error, finding what clicks.
Thanks for all the help!