I looked at your two current sprayers (the John Deere 410R units) across all their passes, using acre-weighted working time. Here's the spread:

Fastest coverage:

Slowest coverage:

The pattern is basically field size and shape. Your fastest fields are the big, open ground (Rowe, Carrick, Quimby, Ransom are all 6,000+ sprayed acres) where the boom stays down and turns are few. The slowest are small or awkward tracts — Barnett is only 48 acres total, so it's nearly all turning and setup with little straight spraying. Nash, Kingsley, and Ackley are the same story.

One caveat: this is coverage rate, not efficiency per se. A small field will always look "slow" per hour because headland turns eat a bigger share of the time — it's not the sprayer or operator underperforming. If you want a fairer comparison, I'd control for field size or look at in-field ground speed instead of acres/hour. Want me to do that, or split this by the two 410Rs to see if one runs faster than the other?