Advise on setting it up ...

I loved mine for the first few hours then noticed it was going back and forth over the same section of the pool.

The instructions say to push down the hand lock and twist it. When you look at the lock from the side you see a perfect semi-circle for the hand to latch into ...
so I used it. It was the wrong decision. After waiting hopelessly for a response from the on-line retailer for some advise I started messing around and then put the handle in the maximum offset position ... opposite on each side.
Now when it hits the surface, the handle stays deal level with the surface and because of the twist in the handle, the Dolphin creeps along the waterline a few feet before reversing and taking off to do a new area. Problem solved.

Good luck with it.