Because of the method used, they couldn't do caps without wiping out all of the detail of the Nissan / Z logo. Now that I have ordered the Z caps, I have popped the Z off first for painting.
As for lowering, yes, I tend to agree, looks like it rides higher now than with the standard wheels (obviously an illusion)
As for spacers, you have me worried cause I have 20mm front and 25mm fitted already.