Exact same situation with my Talon X.
At 70 miles I started noticing a chatter type vibration at low speed under the passenger seat.
Ended up having to put exactly 8oz in sub transmission to get it close to full. Noise then immediately disappeared.
I think the dealership may be checking the oil by screwing the dipstick all the way in.
When mine was low, if I screwed the dipstick all the way in to check it and it actually showed oil (however it was still a little low)
After reading the manual, Honda says do not screw it in to check. When I checked it that way I wouldn't get any trace of oil on it.