Hey dig,
I wouldn't worry about the vps readings. On mine, whether enabled or disabled it reads stupid numbers, any where from 2 feet to thousands of feet high, even when disabled! And it's not obstructed by anything, stock bird.
Side note:
Haven't been around much as this month has been a bad phantom month!!
My main p3p mainboard died, so stupid me sent it to dji instead of doing it myself.
Second p3p crashed when I tried to beat my record of 46000+, so I ordered all the parts and put it all back together, took it out and flew it around a couple days too make sure all was good. On the third day went out about 2000 feet on a new battery moded by a dealer that I had used without any issues( not going to name, since it may not have been his doing) %100 charged, suddenly I see red battery icon thingy on top right corner so I stopped going out and tried to land but it, I don't know where I could have landed because I was above dense trees, but suddenly just cut out and dropped like a rock. Could never find it as I was above dense trees!! Any ways, bought a p4 and another P3P, as soon as I get the p3 I will be back doing the same **** again, I am sure!