My 2000 busa 1397 with walbro fuel pump and regulator set at 44 psi. It is map for VP mr 12.. and has a 12iin. Arm. Gearing 1 down 3 up in the rear. With 200lb rider. Problem is lately when I launch at the drag strip for the first 70 foot bike sputters badly then runs good after it wakes up runs through trap at 145 mph. Please help .