You can always increase tire pressure slightly if it feels too squishy. I prefer the ride on the highway with my P rated 275/65r18 Michelin Defender’s at 35-36psi vs the 33psi spec. I’m sure overdoing this would hurt handling but I find a slight increase in psi is noticeable, and subjectively beneficial on P rated tires.I’m debating that too…my concern is that it’s a lot of sidewall. I think that means a cushier ride which is good, but i wonder how different highway performance would be.
It seems to me that the softer and more compliant the ride is, the more wallowy it gets at high speed.
Finding the balance between high speed stability and compliant ride seems like an expensive process of trial and error.