tire upgrade for ride and noise issues.
 

I have a 2015 lacrosse premium ii. The original tires both front and rear are Goodyear P235/50 R18. I find these tires noisy at highway speeds, and the ride a bit rough on secondary roads. I'm thinking of changing to a tire with more sidewall height to soften the ride; say P235/70 R18 to address the ride issue. I don't know what brand of tire to get to address the noise issue.Can anyone help me here? BTW, i run the original tires about 2-3 psi below the recommended 33psi.