Manager, HMH Pool & Patio
1st thing to know about the Ranger, or any mat type cleaner: they are random pattern cleaners. Where they go in the pool is determined by a number of factors, but the primary cause of poor coverage is the hose is being pushed around by the jet(s), and the cleaner will be guided by the hose.
2nd item: a properly placed hose weight makes a world of difference with these cleaners. Try placing the weight about 4' back from the head. The cleaner should not list forward or backward when running.
The 3rd point is climbing can be controlled (eliminated) with most of these cleaners. You can add an extra weight, with some cleaners you can turn the mat upside down, and others have optional devices to control climbing.
All that being said, the fact that most AG pools have only one return makes it difficult for a random pattern cleaner to operate well. A cleaner that we have had great success with is the Pentair (formerly Sta Rite) L'il Shark, model GW8000. The cleaner will work well in most AG pools, has only one moving part and is reasonably priced. One note, it will not clean ledges and will not work well in a pool with varying depths.
Good Luck!
Mark