Sandman, did you get those used off another member or purchase them back when they were available?
Just curious because I was under the impression even the "custom fab'd for your car" koni struts were discontinued.
I must admit, I think the Bilstein HD valving is just a tad too low for the springs I'm running.
But to be fair, the bit of road I'm using as a reference has every vehicle bouncing to some degree.
Also note you wont go any lower with bilstein's and vogtlands, you'll be roughly at stock ride height.
If you wanted to work a little but have an ideal setup I'd suggest buying used bilsteins off of an 05+ GXP and having them rebuilt and revalved to the springs you plan on running.