I'm not (yet?) willing to cry "perk!".
But I would like to see a much lower ENY value. Currently Ostwind and Wirbelwind do have the same 25 value. Even if we do get the ability to rais ehead in Ostwind back, the Wirblewind will be still more effective in most combat situations. Even with proper lead and aim, a reasonable fast fighter can fly "between" individual Ostwind rounds when passing by.
But my main reason for a lower ENY value is the anti-town blitz base grab. Three or even just two Wirbles can take down a town at a breathtaking speed. In fact so quick, that often there is no time left for any coordinated defense effort. In the last days I have seen a rising number of squad sized rapid attacks like that. By the time the attacked side could muster a few pilots (someone had to spot flashing town, identifying the raid, people have to land first before hurrying to help ect...) it all was over.
So I could imagine a lower ENY rating like 15 or so, instead of 25.