hi. i crashed my phantom after 1 prop flew off. dropped 12 storeys down onto grass patch. clean it up and replaced the screws tightening the props. callibrated in naza and all motor gave no errors. put back the props correctly n powered up. problem is... all 4 motors work perfectly but the phantom just refuses to lift abit. recallibrated the compass too. but still.cant lift even when i push it beyond flight throttle. any one can help me?