If you put the AC or Heat or whatever on it will pressurize the inside of the jeep and stop the flapping. The way you can see this happening is, get in your jeep with the windows closed and the vents off. Look in your drivers side rear view at the side windows of the soft top, they will look loose and floppy. Now turn on the vents in the jeep and look in the rear view, you will see your windows start to bulge out. Once they bulge out that should cut down on a lot of the flap.
Yellow Jeep Club - #34
LJ Owners - #34
2006 – 6,742 Unlimited Rubicon's made