2 more cylinders?

Hi everyone, I recently got myself this 2020 SXT. Coming from a Tesla, it has plenty of power for city driving, is more comfortable cruising, but feels somewhat lacking on the highway.

Once I'll see a good offer for the R/T on the market, I think I'll upgrade. But I have a few questions:

To R/T owners: Is the suspension stiffer then on the V6 models? Is it similarly comfortable for long trips?

To SXT, GT owners: If you do not plan to upgrade to the R/T, what's your reasoning for it? (Aside from financial stuff)

Thanks