USA user - sharing my wheel setup

Hello from the USA,
Huge fan of these wagons. I have the Buick Regal TourX, which is the Country Tourer internationally. I have had it 5 months, here it is and my specs:

Wheels:
Curva C300 20x8.5 +28 5x115
245/40/20 Vredestein tires

Desperately looking to lower the car, but not as much as H&R springs, hoping for other options!?

@vizeweltmeister the +28 refers to the offset of the wheels all around. I am not using spacers.

I used a variox front bumper lower lip, a csr rear spoiler , and the rest is just cheap eBay "lip" for the sides "splitters" and rear quarter bottom.

Thank you!