Johny Apple Bomb
It's good it has helped someone. If you haven't already, try using a 2.4 MHZ back frequency also. See if it works better.
Most if not all of the frequencies come directly from the CAFL list on the net. Then they add the 2.4 MHZ carrier wave. This means that the carrier wave isn't doing any harm to the frequencies and should be giving better penetration and effectiveness.