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205s will be fine. A 16" Turini can take up to a 215 width, obviously with relevant side profile.
Oh and yes you would get slightly more contact with the road but its literally 1cm on each corner, what with the camber on the wheels I doubt you'll notice a huge difference.
I would keep with 195s if you have a 172. It might not sound like a big jump but you would notice duller turn in. 182s have different geometry to counteract this.