Its not that much more pressure and I prefer the handling as well, the tires are certainly rated for it. In our "winter" I like to keep them a little lower, closer to the rating that's on the car door frame tire pressure sticker, not 36 psi cold as indicated but closer to 38 psi.
Yes, there seems to be a perceptible improvement in handling once you reach 40. Under that it's mushy.
That's interesting. I will have to give it a try. I have stuck to near recommended pressures, because my Kona's ride is a lot rougher that my other car, and didn't want to make it worse. But if you say it is the same, might as well get the extra range... I do remember with my old Prius, higher pressures did help, so makes sense.