The time on the surface before getting out of the water and maintaining the use of a rich nitrox during the ladder climb and for the first 5 min on the boat are big factors in helping you here.
Also very important to stay hydrated - use an isotonic drink, try something like this one:-
http://www.harris-active.co.uk/isostarframe.htm
Try adding a 3 min stop at 3m, makes me feel a lot better
Mild fining actions while doing the safety stops also help off gassing (keep the blood moving
)
HTH