I'm curious. Is it all over the place if you're traveling on a flat, straight stretch? Mine varies with the load -- wind resistance, up and down hills, etc. That's because all it does is maintain a steady current, not a steady speed like a car's cruise control.
If yours is surging or sagging regardless of conditions, something is off in your controller and you probably want to start a ticket with Juiced while you're still in warranty.
