Change of formation?

Do you think a change of formation would do us good, if so what would it be? We used the 4-2-3-1 I believe when Martin first came back for some games and we went on that run of good form. 4-3-3 leaves us pretty vulnerable in midfield and I think a number 10 position would be perfect for Nygren who already scores for fun whilst giving the midfield more depth.