Very nice upgrade on the brakes! Like you mentioned wheels can be hard to find that clear these calipers ...even some 19 inch wheels I tried would not clear.
Yeah I've noticed that a lot of wheels have "will not clear Brembo brakes" in their descriptions. See it a decent amount since more than a few of the aftermarket 18" wheels I look at are intended for the late model mustangs. Definitely something to consider.