I'd like to see the ENY kick in a bit quicker. First, the Me262, Tempest, Spit16, and P51D would all get an even lower ENY (2-4 range), then aircraft like the La7, George, F4U-4, and a few others would get a step lower as well. The scale needs to be adjusted and spread out with more steps, there are too many interval steps of 5, imo.
But on that note, I suggest people learn the 109's as someone else already suggested. They are quite capable aircraft once a few of the minor Achilles heels are learned (and avoided), and the better attributes are capitalized on those 109's can hang with anything if flown in their performance window.
The 109F-4, albeit a single 20mm cannon w/ 200 rounds and dual 8mm MG's, the plane is quite agile. The 109G-2 is the same thing, but ever-so-slightly less agile but that much faster. The G-6 is the most stable and easy to fly but being slightly slower and a wee bit less capable in the turn and climb. The E-4 is... well.... an average aircraft in the EW and I'll leave it at that.
The G-14 and K-4 are the heavy hitters with the 30mm option, and their ability to climb is second to none. Keep in mind that the G-2 is faster than the G-14.
Oh, and leave the gondolas off unless your in jabo or bomber hunter mode.