I know i'm still learning my 4.8is, but I wanted to make sure this is just the way it is. My steering is generally nice and easy. The way power steering is supposed to be. At highway speeds, I think it feels a bit tighter....which is fine. At low speeds, most of the time, it's pretty light. But every now and then, it's a bit tight when making turns from a slow roll (like making a left turn out of the intersection, or slow down to make a right turn. I'm thinking that maybe at those time I brake a little hard and it activates the sport mode and tightens up. But I don't recall. Thoughts?

Oh, I have the air suspension and aftermarket wheels if that matters. The wheels are 18s. And like I said, this doesn't happens all the time.