If you collected a 3' radius, that's the best you can expect. That means your problem is circulation of wind.

FWIW, I flew multi-line kites with my boys for a number of years, and you end up learning things about wind you never knew before. Even though your house is between the pool and the wind, that doesn't mean you're home free. Your pool is in your house's 'wind shadow', and often you'll get ground air moving in the opposite the main wind direction, in the area close to a significant shadowing object. With a kite, that means your kite 'collapses' and even drifts in toward you. With a pool, it could mean that the debris moved TOWARD the wind.