Hi Eddie, I'm also running a P3P and Nvida Sheild K1, only flown for just over an hour so far (pesky NW UK weather!), so far I've updated to latest fw despite some misgivings all went well, I've changed nothing on shield and found it to be great if a little heavy/wobbly on the controller. Bright sunshine hasn't yet been a problem, will probably make a my own Sun shield should it be required.
Enjoy