Last weekend the eny bit hard. For a time there I could not get a P38J. You see this at map change briefly but for some reason a couple of times the rook nation dominated the other countries in numbers online.
At first I disliked the eny system but now, like the three country system, it is the best compromise during an imbalance. My only suggestion has been to control perk planes by numbers in use in conjunction with population. Every time a 262 goes out in a country as an example, the next cost slightly more than the population set cost. No 262s in use price drops.