Its good that u have taken any action but its gonna be slightly change and not instant but in 1-2 months when the new players will level and gear up, and even then they will have a small impact on the current situation. The best possible solution is to allow elyos change their side because those chars are already geared up and guess they have pvp attitude coz they obviously wouldnt change their side for pve, even 20-30 of them would be a huge matter. The only reason why u won't allow this, is probably u dont know how and I understand that, but also, in that case, I'm afraid about the server future.
Genius