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Need help jetting a '07 YZ 250F

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I have a '07 YZ 250F the only mod is a pro circut exhaust. I am experiencing a major bog in the 0 - 1/4 throttle range, the fule/air screw is about 2 turns out (the bike still has stock jetting). Should I be looking at putting a bigger or smaller pilot jet in? I am about 200-300 feet above sea level. The temperature is currently about 20-35 degrees F. Any other carb. mods that may be necessarry would be appericated.

Thank You RUP2604

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