For the past 6 years I never had problems with arena caps, just wait 5min and they'll drop.
If you don't like the ENY go to the other arena, it will most likely be low. Yeah ENY sucks and I hate it, but would you really want to see La-7s and Spit16 when your outnumbered 10 to 1? Chose something with a high ENY to fly and you'll be good (or something that has a older variant that handles almost the same).