In fairness, it's still pretty darn close. We are talking like 1/20th of an inch over the course of an hour difference when compared against the other rotators average.
You need to compare with percentages. If the smaller rotators give a 0.39 in/hr rate, and the 3500 gives 0.45 in/hr (in square spacing at 40 psi) then the 3500 applies at a rate over 15 percent higher. Increase pressure to 50 psi, and the 3500 can apply at a rate almost 40 percent higher.