I'm having a lot of trouble with my PoolCleaner two-wheel leaning back and lifting the suction off the pool bottom. I have tried placing the floats in just about every position imaginable, including adding more floats to the line. I even had so many at one point that the cleaner was floating up off the pool bottom. There has to be something I'm missing. How do I stop this thing from leaning back and lifting the suction off of the pool bottom?