I've seen a fair amount of info recommending that the props be upgraded but I'm having a hard time getting a handle on this. It seems that the original Phantom had 8" props, the Vision has 9.5" props. Most of the sites that list the props have 8" or 10" and everything I've seen so far is "out of stock". Will the 8" be enough to lift the Vision? The 10" won't fit so it seems that I've not been able to find any alternative to the stock props which do seem to be available. I did find a set of 9" but they have been "discontinued". Whats the deal with the props?