When I first got the phantom v1, 2200 mah, 20c battery, I got ~8 min flying time. Now I get ~2:30 with red flashes. 1st level protection is at 11.55, 2nd level at 11.1v, with 12.55v showing on multimeter. I'm waiting on lipo battery meter from china, but in the meantime, what would be safe settings to set the protection, to get better flying time? I use the phantom v1, gopro3 in case, stock pops. Any help would be appreciated.