Another option could be a little bit of rust buildup on the middle of the rotor/hub. Get a wire brush and clean it out. Spray it with some brake cleaner. I just installed some 25mm front spacers and I got a little bit of vibration. Going to take them off, clean the hub, and retorque them.

Where did you buy the spacers? I got mine off Amazon.

 

I put 15mm spacer adapters on the car for winter, to poke the OEM wheels w/snows after a drop last year. Was expecting... something. Maybe a vibration at high speeds, or an awkwardness to the wheel. But it turned out perfect. Car rides true and smooth.

Lucky? Normal? Whatever, I'm not complaining.

LOL

Good old Zombie Thread about spacers. Neat to see Ash's comments again. I really liked Ash.

 

Yep, Ash was one of the good ones

 

OP, if you still have the car do you have any better pics of the front wheels in relation to the fenders? I'm in the same boat as you and from your original pics I'm almost thinking 25mm spacers would sit more flush / match the ever so slight poke of the rear wheels.