I went out today for the first time since doing a bottom job and the humming was a deeper tone and started (and stopped) at a lower speed. I would guess it started around 5 knots and stopped by 8. I didn't get much faster than that since winds were pretty light today, but at least I was able to determine that it did indeed stop and it wasn't because I couldn't hear through the splashing. I haven't done any work to my rudders or daggerboards, but I did change the standing rigging which might have changed the mast rake a little (not much though).

-Rob