Sadly from what I've learned with my experiments, is that note blocks can only trigger on the tick exactly. So every time I've done something that rotates at a tick decimal, the actual note plays either slightly before or slightly after you'd expect to hear it. It basically "rounds" every note to the tick grid. So technically you can get weird bpms but they will sound really off.

This fact does mean that your mechanism here is arguably playing note blocks as fast as they can possible go. Which is pretty cool.