"I have no data but the Hurri IIc always seems to hold E better than it ought."
If you mean in a dive so that is my observation too.
If you get to dive into a fight you can briefly catch any plane if you don't dump your E in a steep turn. I don't really understand how it does it with such a thick wing, but hey, same goes with Tiffie and it really was a fast plane. Although their weights are really different so the lighter one should not be able to overcome much of the drag with its lighter weight or less power (thrust).
And of course a good gunner can kill anything from 800yds with those guns.
-C+