'hoochy-coochy' (how does one measure that anyway?!)
Can't say, but I know it when I see it!
Actually, it's like a rapidly oscillating boy-yoy-yoing at each end of travel, several small, really fast back and forth motions. Damps down in about a second. Think something out of a Bugs Bunny cartoon. Doiiinnnng!!! I'm sure this must be helpful.
Buy anyway the 8300 is making the sharpest prints I have ever seen so I don't think the vibration is hurting anything, and the designers must be aware of its presence. There's no vibration while the ink is actually being laid down, it's all at the ends of travel.
I suspect you are seeing a much more leisurely back and forth movement from that table, which would not be the same thing. You know I'm just guessing that the vibration is intentional and a good thing, could be wrong.