4x5... ready now don't move!

recently I have found it to be difficult keeping my focus when shooting 4x5 film.  I have been treating my graphic like I do my Mamiya, shooting it at its widest aperture to achieve that shallow DOF. The problem I am having is trying to keep my focus dead on without losing it from the model moving! This last weekend I shoot on 4 sheets, 2 Plus-x and 2 Vericolor sheets. Although the Plus-x are already developed and awaiting to be scanned, from just looking at them I think I missed the focus. I will find out here soon cause ill be tossing them in the scanner. In the mean time heres another from last week. The model here did extremely well with staying still =) Untitled_Panorama1