I have a cowl induction hood so the air blows right in the middle of the windshield. I'd have the same skipping problem.
I first tried some of those little fins that you attach to the wiper and they worked great but looked really dorky. Now I use some wiper blades that are designed to use the air flow to push them down. They work great, also, but look normal. I can't remember the brand. I just got them at a local farm supply store called Fleet-Farm. They're something-Aero. There is also a brand that has small, less dorky looking fins built right into the blade.
One of these should work for you, I think.
Of course you're making us drool at the thought of having our 'Stangs on the Autobahn.
I'll look around and see if I can find some links for you on the specific brands.
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351W 89 Mustang GT Convertible