I am a little confused as to why there's a mechanic to encourage side switching, ENY, and then one that strongly discourages it, a 12 hour country lock.
That makes two of us, but ENY's penalty is mostly an illusion:

ENY is effectively neutered unless the advantage is monumentally large. If the 12 hour rule was "86ed" and ENY kicked in much sooner, the paranoid horde mongering country loyalists would probably just log off. They want their late war monsters - and their hordes too. People who spend significant time in subpar rides are a minority and side switchers even less so.
Forcing people to either switch sides to fly their ride, or stay and fight in something sub-leet would just piss most people off.
HTC probably has to do it this way to keep the most people happy. Or at least somewhat less whiny.
The ENY scale should be expanded to 60 or even 100. Make the least capable rides more attractive by offering larger perk bonuses.
Basing kill/score points off what the participants were flying could also encourage more people to get out of their crutch rides for a bit.