First: I have the manual up in another window. It is remarkably unhelpful.
This is a used unit, so have no idea what has been done to it.
Whatever, before I go playing with adjustments, which should I address?
The thing will not stay on the bottom - it is heading nose up and off the floor (on the plus side, no problem getting it to climb walls).
It worked with the old, leaky booster I replaced, so the hose and fittings would seem OK.
Do I screw down the knob on the wall connector (The manual doesn't ID this as the pressure relief valve)?
Do I adjust the thrust direction on the exhaust jet?
Is there another way to address this?