I had a nearly identical antenna to yours, but had instead used W7FG's
600 ohm ladder line. Apparently this has a lot less wind surface area
than your 450 ohm stuff with all that flat plastic between the wires
because I never had the "sailing" effect you had, even in some 75mph
storms recently on the Oregon coast. My stuff just doesn't have ANY flat
surfaces for the wind.

You might consider switching your feedline type.


Ed K7AAT