I have a '23 PW and I had lowered the threshold and ran about 40 psi on all 4 (stock duratracs). A couple of weeks back had the oil changed and they put air in all the tires. I did notice a small difference (made me check the pressures because it definitely felt different), but I was surprised that for me, it wasn't all that big a deal. I figured I would leave it at full inflation since I intend to get 35's soon and maybe it will be an even more pleasant ride (as I will definitely air down those).
In other words, I didn't really notice it too much riding at full pressure, I definitely don't notice it being floaty over rough roads like I have the times I've driven an empty flatbed or box truck (which is natural since the suspension is so soft).