Well, again, maybeI'm missing something but, first of all, there is no Canon HDV 30F preset in CS3. And when I do a search, I find only a preset download for Premiere 2.0
CS3 comes with presets for 1080i 30fps but it's not the same as the Canon HDV 30F as far as I can tell. That means when you import from a Canon XH, for example, the footage needs to be rendered when it's dragged into the timeline.
Did you ever get the issue resolved with CS3? I'm having the same problems and can't get it fixed. I've got the 3.1.1 update and even put the PP 2.0 presets in my CS3 presets folder they still don't show in CS3.
I would love to hear what you did to solve this issue.