More interesting info:
I graphed the injector duty cycles for runs 3-5:
Z4M VF570 duty cycles 3-5 by
M detaR, on Flickr
They plateau at ~73-75%
Also, the M3 VF570 kit uses 52lb/hr injectors while the Z4M kit uses 41lb/hr injectors. This is most likely due to the different FPR, but still interesting.