Its a warbird, you need to have some speed to overcome the weight/wing loading. Lots of good info, and lots of different ways to do the same thing. I don't worry to much about static numbers, I certainly check them, and use that data, but it's the flight numbers that matter to me. Your CC Edge ESCs do have datalogging, so get yourself the data link and cable
http://www3.towerhobbies.com/cgi-bin...&I=LXGVR8&P=ML. Pretty easy to use. I do a ground run and make sure numbers match the watt meter, as a sanity check. Once you are ready to fly, make sure you clear data history before each flight, and try to get someone to video the flight. Makes it very easy to see what the plane was doing, vs performance numbers. But back to your props
I guess the big question is, do you like the way the 16" props look on the plane, or do they need to be smaller? I'm don't think I've seen a VQ with 16" props.