When towing primarily and last vehicles where in the same class. Had an Enclave and Acadia. Having to make a lot of corrections on the highway when towing and gets tiring after several hours in the wind.Are you talking about when you tow or just in general? If you are talking about when you tow how heavy was your last to vehicles compared to the Ascent.
As far as when not towing I think the Ascent is great at not moving around in high winds. Especially on some of the bridges near me where people complain about the wind (I did in my old Xterra) I have no issues with the Ascent.
Messed with tire pressure a bit. I adjust depending on tongue weight and how long of a road trip. Anywhere between 35 and about 45psi for the rear and usually don't mess with the front too much. If I don't trade this thing in for the new Explorer I'm going to see if i can swap out the sway bar and see what happens. The rear just feels disconnectedWhere's your tire pressure? I've played with mine and gotten slightly better results. Too high seemed worse.
Oddly, lowering my seat seemed to help, but I think that was because I had it all the way up, which exaggerated the feel of every gust or curve.