I agree with chandltp and others: If the road isn't wide enough to be passed with the other car staying in the same lane, then I ride so (s)he has to cross the double yellow line (or whatever) in order to pass. This doesn't necessarily mean saying that I ride in the middle of the lane, but far enough over. This violates neither the spirit nor the letter of the state law.

As for your conclusion, in general, I'll disagree. On windy roads, by riding where they would have to cross over, I find cars are less likely to try and do something stupid. If they do regardless, at least you have space to move out of their way (where as if you're hugging the white line, you're out of space).

On windy roads where I can see it's not safe to pass, I'll gesture this to the cars behind me (I'll stick out my left arm with palm toward them and shake my head no). Yes, they are free to disregard this, but I find that almost all cars wait when I do this.

For whatever it's worth, I don't think this is a trike issue, or even a 'bent issue (although I agree that many trikes are lower and need to take more care to be visible).