The Brewster does not need its ENY to be lowered. Those that think the Brewster is uber just don't know what they are talking about and really no nothing of the Finnish Brewster.
Your right I don't know about the history or the specs of the plane, but you can't deny I have a pretty good knowledge of the game and the fighters in it....and that's what I base my opinion on ENY off of....like it or not it's just my opinion.
If I can up it and land 4-5 kills pretty easily, I think it should have a lower eny....I literally upped it after a conversation about it's eny on 200 and landed 7 in a ozkansas center island furball.....I was flying a K4 prior to that and was having problems getting 2....EVERYONE would agree the K4 is pretty easy mode in the MA.
Instead of 20, I just think it should be 12-15.....you can almost always up no matter the ENY but it isn't a perk farmer.
Again just my opinion