Def do the washers. Pulling the pin may not gain you anything as it's very car dependent. Some (including me) could only get about -1 with pulling the pin, but using a washer helped a lot. I'm not sure I'd like a 245 square setup as the rear can get loose with my 275 Star Specs, so 245's would be worse.
Switching out the Conti's for Star Spec's improved my time about 1.3sec on a 60ish second course relative to my class competition, so I really am not a fan of the Conti for trying to be competitive. They help you learn car control as you try to manage your tires, but your not fast.
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Current: '13 E92 M3 Euro Delivery
Gone: E86 M Coupe; E30 M3, E39 M5, E36 M3
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