Well, just one tip. Don't share your SS over both healers, just SS the Paladin....that way you have 3 consecutive wipe recoveries (as opposed to sharing on both, you only have 1 wipe recovery).

It seems like a good setup, although I don't know if only HoTs will work for Heroics, you'll probably need to focus a bit more on healing at that point, but again, never done it solo, so dunno.

Good luck with it.