Onomah for Hourihane would give us an injection of pace and physical presence.
I think part of the drop off with QPR was going from a nigh on full and bouncing Villa Park, hammering a promotion rival, to a mid-week game against no mark opposition in front of a 2nd round league cup atmosphere. It was flat, so the drop off was as much psychological as it was physical.
I think the bulk of the squad would be ok, but that extra pace and presence in midfield would be a lift.