It would be nice to know their sources... on a lot of planes, not just the brewster.
I am sure any current or future competitor would love to know as well.
My advice, if you can come up with flight test data that contradicts the flight test data then by all means, send it to HTC. Barring the lack of any such data, just figure out what the differint planes do in "the game" and fly them to their strengths and against their weaknesses.
The Brewster is a lot of fun to fly and thats the bottom line for me.