I'd be tempted to drop Howard too. If the ref won't let him get away with fouling defenders he disappears from the game, he was anonymous for most of Saturday's match. Having Campbell alongside Hume or Fryatt may work well, and could stop us from hoofing it.
I don't think Hume could make much of an impact from the bench, it's not like he's someone who can take advantage of tiring defenders with pace or strength. On Saturday he tried hard but his passing was woeful. After his first couple of games on the wing earlier in the season I thought he did OK, but since then he's been rubbish in that position. The only time he looked any good on Saturday was when he went up front for while.