4-4-2 Narrow Diamond is pretty good, depending on how your MCs face up against your opponents. If you have the edge then this is probably the best formation. You don't want to play a 4-5-1 V because that places your two attacking midfielders in the same lanes as your opponents defensive mids, and with only one striker (without outside mismatches) your going to have a tough game. If you have 2 good AMCs I would consider a 4-1-2-2-1 as they should have space in front of the goal.