I just bought a Dolphin Deluxe 4 cleaner to replace my old dolphin diagnostic. Loved the way the old one would clean a swath on the bottom of the pool floor as we live in an area which has dirt storms and there is always silty dirt on the bottom of our in ground vinyl lined pool. Well, the new one picks stuff up, but not even close to the power of the old one. The manual is pathetic - are there any tips on settings, etc that I might try? Also, I would like it to spend more time in the shallow end of the pool and it heads for the deep end right away and spends most of its time there or on the walls of the shallow end. Any suggestions? Thanks for all input!!!