I think you'll be fine.
I'm running 275/35/20 rear
245/40/20 front
I've no issues with rubbing. Front strut has about 5mm clearance and I can see some mild scuffing but never felt anything or heard anything.
Confirms that I could easily fit 21's.
Just had a look at tyre sizes. 275/35 gives a diameter of 27.6" (701mm)
305/30 is 27.2" (691)
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