To avoid bottoming out if you're ~2.5" lowered in the front you need ~400+ rates. For the rear 350+ starts to make good turn in.

Rear spring rate often plays a larger role in ride comfort, so people tend to get a big rear swaybar and keep the rear rates modest. I have 350/350 on progress and it's very tolerable for daily driving. I'm a tad low for 250lb front rates, but progress only had the 250, 350, and 500lb springs available.

I never have any rubbing except on large dips in the road. Here's me in the car at SoloAtlanta's novice school from April