Up to you, Brother. My batch had four ounces of 8.9% MB added in the last 15 minutes and the aroma I'm getting is righteous. I do not detect any citrusy character to this hop, really. It seems very clean, very German, bright, crisp, Noble, etc. I think the newest thinking on dry hopping is that 5 days is plenty but give it a try and see what happens.
I don't get much citrus either but what (I think) I get is candied orange in a noble setting...... I can't see how a little bit of MB could hurt