Take all new stuff back, tell them it is incorrect fitment,request full refund for unused unfitted items in original packaging,,,, and that you have existing better quality Bilsteins!
Since they are all out of car, contact/send them off for shock dyno testing, if thay are within limits for that model unit, then pay the dyno cost, and refit.
If they need some work, then go ahead.
Badically, if you can, with effort, put a unit between you legs with one end on floor, and other end in your palm of your hand, and push firmly down, and it comes slowly back up, and all feel the same, they will be pretty right.
You cannot get a better quality unit, considering you already have them, your costs from here on will be minimal.
I run them in three of my competition cars, and Koni Reds in a fourth( to comply with rules)