Harris family, or Harrises would both be acceptable. As far as what is most widely used, and so accepted, then simply DPS would be it. If you tried to add an s, es or 's to the end of DPS you'd be making it damage per seconds, which changes its meaning completely.
You'd be surprised how many people confuse then and than, as well as the use of would of instead of would've, both pronounced the same, but would've is short for would have, which most of the internet write as would of. The same applies to believe and think. They're entirely different words. I once had a fairly long conversation with someone that refused to accept, or believe, that I didn't believe in anything.
As far as stam drinks, or well fed buffs go, they don't stack and Halaani is the best you can get. Rumsey is second. Of course if spirit is important to you, then a case could be made for the cooked buffs as well. If you make a habit of dying more than three times in a single game, then feel free to use Rumsey as a replacement. I always carry a stack with me for just such an occasion, although I rarely use it. The alliance only crystal of vitality does stack with well fed and guardian elixir buffs, so you can have 5 stam from that, 5 stam from a scroll and 20 stam from the whiskey at the same time.