Hello, Recently I purchased the Phantom FC40. Upon take off on a fully charged battery, the low voltage warning LED's kicked in 5 seconds after take-off, the Phantom automatically landed. Here are the stock settings: After I adjusted the stock settings to First Level - 11.10V and Second Level - 10.90V I am getting around 5-6 minutes flight time, what could be wrong? would it be safe for me to lower these voltage settings some more as flight time is still little with no load, I haven't attached the camera yet. Thank you!