Airush lift 20 vs Flow 18 vs Liquid Force 20

[kitester]

Hi guys. I sail and teach in North Fl. and much of our wind is very light, in the 10 to 12mph range in the Summer. Many times we are waiting for the wind to pick up to 9 so we can put long lines on our big kites and do down wind runs. I know it sounds sad but, we get enough good days to make it worth while. My question is how do the Airush Lift 20 and the Flow 18 compare to each other in light winds and, if any of you have flown the Liquid Force Tension 20, how would they compare to it. At 185 lbs on a 169 Litewave and the 20m Tension I can just hold my ground in a steady 9mph wind if there is no current.