I got some 3/8 PS Ropes polyester double braid today, and will try that. My wholesale source had no 7/16 available, and will get some 1/2 inch soon. I think the 3/8 will be too small and bite too much, but we shall see. If I find the perfect combination, I might not be such as Vt addict.
I also saw their Vectran, which is even more expensive than Plasma. It was developed by Cortland Cable, which specializes in small lines. (They bought PS Ropes to be able to have the Plasma line). Vectran has almost 0 creep, and was first used for space shuttle tethering, as well as weather balloons and other giant balloons for moving cargo.
Anyone want to buy some 1.75 mm Zing It, I have over 600 feet more than I need, you can have it for 9 cents a foot, plus no more than a couple grand shipping.... or see me in Seattle.