Where does the N come from, Also, will two passes with a 750a (and no other cultivation) oxidise much more organic matter?, doesn't sound as enticing then. If it needs the N/P give it some otherwise your just kicking the no-till organic matter/soil condition sweet spot ball further up the road.
As I said, because the plant stand changes so rapidly from drill overlap to middle of the field in a place that isn't exactly where the liquid fert would have overlapped, I'm not convinced it's so much a localised nutrition problem.
I think the big thing the 2nd pass with the drill does is consolidate the soil in a better way than our set of rolls can.
Have a few areas where I ran the power harrow through afterwards and they look better too, and I'm not sure that's an N mineralisation thing.