Well the rolling radius is a bit larger than the standard 205/50R15s, 215/40s might be a better bet.
Did you get the offset checked on your new wheels? AFAIK it should be 42-45mm. A skim might sort you out (providing it's within spec for the wheel).
Failing that you're looking at lipping the arches
mucho expensive my friend.
I had a similar problem with 205/50R16 on my car and they are smaller in radius than 215/450R17, I got 205/45s and all the rubbing disappeared.
Fitting stiffer springs might stop it happening as often, but the problem will not go away. In any case you don't want to shake
all your teeth out, now do you?