Don't think 4-4-2 would be any better, probably worse. The thing about our revival is that a lot of goals and assists have come from midfield, and by shrinking midfield we'd be eating into that. We have enough problems with getting the midfield firing without Jack anyway.
Can RHM play LW? Worth a shot, I'd have thought. Or play him RW and shove Snoddy in the Jack role, but I don't know who then plays LW; possibly Barney, but I think he's better in the middle.
Only thing about 4-5-1 is who plays up front. Could be Hogan, Grabban or Davis. I'd be tempted to stick with Hogan. Alternatively could play Hogan LW and one of Grabban or Davis in the middle.
Not an easy decision, but surely we our "huge" squad we ought to come up with something.