The FRPP tune might be a little easier to drive at those rpms. But there are other things you can do.
Let the space between you and the car ahead "rubberband" a little and you'll end up being able to use just the throttle to control your speed more of the time.
Question - do you perhaps mean 2200 in 4th as opposed to 1800 in 5th? There's 10 mph difference between 1800 in 5th and 2200 in 5th and the difference in speed (40-ish vs 50-ish) doesn't sound like the question you want answered.
Are you at all opposed to running slightly shorter tires, say, something like 265/40-18?
'08 GT coupe, 5M, wheels, tires, pads, fluid, a few suspension mods . . . still almost stock height
'19 WRX, 6M (the "family sedan")
'01 Maxima 20AE, 5M (the spare and occasional winter driver)