I took the word "wishbone" from the catalogue. And even in German it is called "Querlenker". And from technical sight it is a real wishbone, an adjustable one but a wishbone.
I can hardly imagine, how the wishbone can come in touch with the spring. I don't have a car to take a look at but did you fit the outer joint to the rear side of the wheel bearing housing?
From the distance I have no idea for the front axle tyre wear. Fitting in a lowering suspension kit should not lead to excessive wear as long as all bushings and joints are in well condition .
