Tim, HTC doesn't always model things 100% the way they should. Sometimes they take a known flight model and tweak it as a gift to the players. Example1: the F4u1/F4u1A. Example2: The 190A8/190F8. They just recycled the power charts, despite this being inaccurate. On the other hand it gives us additional aircraft to play with.
As for the P-47M, there's some question whether they ever flew with 8 guns (weight savings being the idea behind it) and there's almost no chance they flew with more than 267 rounds per gun either, so currently there are too many loadout options (while missing some DT options, no less!).
It's funny to say "at 25%" it can do X or it can do Y. Because "at 25%" it doesn't even have 10 minutes of flight time. 25% internal fuel gives you about 9.5 minutes of gas. That counts taking off, climbing out, trying to find a fight. By the time you're 10mi from base you have to turn back to land again!
Might as well say "A spit can do this at 25% gas" -- it means nothing in AH because you won't find a spit on 25% fuel unless he's already RTB and has 5 minutes gas left.
While the 47M is faster than the Ds, I've been eating them up in anything from p51s to 109Fs, to C2s... It may be fast (more power to ya) but it's still a P-47 and it's no zeke, it's no spitfire, and folks that keep pretending it is in the MAs are going to keep dying to my guns.
And the folks racking up 7,8,9,10 kills per sortie are doing so in a way that is easily repeatable with P51Ds, P47D40s, P38s, 109Ks... It's no credit to the ride that you're landing kills, unless you are doing something that you couldn't do before. A pick is a pick, be in a tempest or a P-47M. Try mixing it up and you'll see what a lot of folks in the MA are seeing: dead P-47s.