reduce max chaingun ammo to ~30
worked marvelously well in SoA
This doesn't address the problem of an uneven playing field. It just adds punishment for those unwilling to use no interpolation.
Let's be honest, the majority of people that don't want interpolation don't want it because it allows them to abuse the balance of the game. You're the minority, one of the few that wants no interpolation because your connection rate blows to US servers.
That might be a solution. Allow users with higher pings to make use of no interpolate. There's a bitflag that allows the server to force no interpolation ( on a per-player basis ), so technically this would be possible to implement as a server-side option.