You know, while drain is probably ok by CR, I think I prefer Con damage, since it doesn't seem to be a permanent hp loss (of course, I don't know what the wraith used to do). Not a big deal here, though.
Freedom of movement specifically calls out paralysis as something that impedes movement. "This spell enables you or a creature you touch to move and attack normally for the duration of the spell, even under the influence of magic that usually impedes movement, such as paralysis, solid fog, slow, and web." I think the question is if we want to limit to higher level spells or what. Thoughts about saves, etc, also?