Fly for who you want, for whatever reason. If a place is too crowded go somewhere else to fight. It's a big arena, and there is bound to be action at an acceptable level somewhere.
I owe allegience to no country; you might see me on any side. I just look at the map when I arrive to decide where I will find the amount of action I want.
Take tonight. I had flown Knights last night and popped in (still a Knight) and noticed that there were at least 8 B-17's launching a raid from 9. Now, many times I've munched on such a juicy target, but tonight I grabbed a P51 and decided to work the escort side. Now such a mess of blips was bound to draw prompt attention, and it did. The Spits, Macchi's, and 190's came in, and I'd say things pretty much evened out. I don't know if the B17's hit anything, or even if they ever intended to for that matter... I bagged 3 and landed. Two more sorties, 2-3 more planes, landed all times.
Did we outnumber them? In that region, yes. Did they complain? Hell no! In fact, had I played the other side I would have been thrilled to see so many 7K buffs rolling in. I'm sure everyone had fun, and tomorrow I might be a Bishop and hit the bombers.
Play it within the rules, but in the end the numbers will vacillate night-to-night. As long as no one resorts to cheating it can be fun!