Are you sure you don't have any rubbing .... Be honest.
I was told somewhere more than once .. that 18x9 30 would rub or poke. Apparently it's perfect though.
Instead i settled with18x8.5 38 which is sunk especially in the rear. It's a few mm away from the front strut. I've been avoiding spacers as I've never been into that and would rather keep it that way.
Yours is fire though. Good call on the 18s .. that is the correct size for the car. I may have to get the concave et30 ARC8s I originally wanted and see if I can get it right on the third try...
Also good call on the yellow zinc hardware.