This weeks Cycling Weekly over in the UK had an article about tires and aero wheels. Some tires can cause aero wheels to stall, something about needing micro turbulence near the rim or some such. Slicks with no treads are the worst apparently.

This article said that Conti GP4000 II were the best tires, but this was completely by accident.

Yes. It's dependent both on tire wear and on the rim it's paired with.

I.e., you are exactly right that a well worn tire is going to stall earlier - MUCH earlier - than one that is not worn. Especially on the front. And you certainly can feel it, especially on deeper section rims. In Zipp's own testing (done by Josh Poertner), a 23mm GP4000S with 500mi was no better than any other tire, which is a huge contrast to a new tire which blew everything else away.

Certain tires also pair better/worse with certain rims. Continentals are fast with pretty much everything, but there are other tires that only work with with certain rims.

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