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For vHoF on my dark elf I do nothing. If on high elf I cure like most in my group. Though I only do HM. If in non HM it is not as bad, but my guess is many who are not dark elves cure for that fight. It is just to fast and easy to do so once you get to the final boss.
Not usually. Its not an issue if you set red cp for the content being done, and the cp spread is the same regardless of being a vampire or not. If it becomes an issue, which it usually doesn't unless there are group issues, consume Bloody Maras to turn stage 2.
Double Bloody Mara drink until you're at stage two, re-eat your base food, then use Mist Form to bring it back to lvl 4 afterward if needed. PvE is expensive...