Hi, I am awaiting delivery of my P2 w/Zenmuse H3-2D gimbol. I already have a Hero 3+ I live at altitude (over a mile up), and because the air is thinner I know the Phantom won't behave the same as no flying devices do, regardless of their size. Anyone here have experience with that? Should I expect a big performance hit? Are there upgrades to make it more high-altitude compatible? I've heard that the carbon-fiber props perform best at higher speeds, but I don't know how that affects my situation. Are there high-altitude stability or safety issues I should be aware of? Many thanks in advance!