I am thinking about this setup as well.
fr. 20x9 et30 + 15mm spacer (255/35/20)
rear 20x10.5 et25 +15mm spacer (285/30/20)
You could probably do a 305/25/20 in the rear but I need all season tires and that's as big as I can go with the Continental DWS tires.
The offsets on these wheels, while lower than stock, will still leave the wheels tucked in the wells too far IMO. Needs spacers. 15mm spacers front and rear should get you flush.
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