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Could be the hub. - yep. I'll replace it.

Could just need the prop blades to be cleaned up - planning to get the repaired at a local shop

Take a video of the boat running with the vibration. - there is no way it would show in the video

At what RPM does it start. - 2100

At what RPM does it stop. - 3000 maybe, but at that point the boat is starting to plan and the vibration is not really noticable

Does it resonate in advanced neutral? - I forgot to check

Are the rails vibrating? - no, I guess not

I think I'm all set. No need to respond.