There's a certain ENY30 plane that is by far the best harvesting fighter - and no, it is not mossie VI. It is a forgotten fighter due to its younger brother.
The issue of country hoppers before reset is a total non-issue. True, some players need perks more than others, but they are few. This is a vetrans game (unfortunately) with very few new players. Also, a very large fraction of the population are in squadrons and will not jump countries for a few perks and end up separated from their squadies.
Those that really want to earn perks are best served by moving to the LEAST populated country and fly that ENY30 plane, or some other ENY>=25.