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04 yz450f stall and stuttering

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My first problem is when I suddenly open the throttle it will stall. I think I have read that I can fix this by shortening the AP squirt? The second problem is I recently installed a powerbomb header making the jetting lean? I get this wierd stuttering sensation at close to full throttle. Do I go up a main jet size? To temperarely test the jetting I had to turn the fuel screw out to over 3turns. Would this cause the weird sensation I'm getting at full throttle? Since I'm having to mess with the carb would using an O-ring or wire the AP be benifitful?

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