I have already said "its because he's using mk4 rims which are narrower and have an offset of et42"....it makes a difference as when on std wheels the calipers are close to the wheel that et1 and half inch means they get snug (too snug sometimes)
You are correct...but the design of the rear of the spokes are different 7" ET43 to 6.5" ET42.
The offset shouldn't affect it, nor should the width, if the rest was the same...but they aren't.
The curve on the spokes is different between them.
But, as you say, that's the problem.