Clockwise is correct, as you've obviously figured out by now.
As far as the direction of the vains, The TPS ones I had said one thing, and the PowerStop ones I have now said another. Ultimately, I don't think it matters. The car stopped fine without them, if they're the wrong way it's not going to matter. If you installed a Baer or Willwood kit, I'd go with whatever they said, but really drilled/slotted rotors are more of a form thing over a function thing.
The improvement you're seeing is probably more from new rotors than them being drilled and slotted. Either way, they look a hell of a lot better, and definitely perform better than worn rotors. That, and they're cheap.
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