I think Ruemon should be left the way it is.
People who want to go to Ruemon, go to it.
Those who don't, don't. It just happened that most of the players were on Dione.
Ruemon works, for what it was intended. The realm that wants the buff/PvP more, wins it.
If you change the mechanics any more than length or amount of Ruemon battles. Such as increased reward or a buff for the outnumbered players, than you end up with a bigger problem.
If you give a buff to the side with less players, then you will get people flaming the weak players for being in Ruemon. "OMG WTF are you doing in Ruemon at level 24? You are giving them a buff making it hard for us. GTFO you **** nub."
If you give a bigger reward to the winning team, you just increase the imbalance beyond what it is now.
I think the problem comes from a lack of other avenues of PvP.
If there were other battlegrounds and forms of PvP, then there wouldn't be any problems.
The few Eos that want to PvP, could go get it there instead of the ENTIRE REALM VS REALM battle.
When you allow unlimited access to a field of PvP 1 side will almost always dominate.
Granted, if you removed the timeframe from Ruemon, and left it open all day. You would see the buff switch sides a little bit.
Dione players might log off, Eos might log on....Creating another imbalance in favor of EoS, but then when Dione players log back in, it's back to the way it was...
If you put two kids in a playground and tell them to fight out their problems. The stronger one will win.
Whether the strength be more intelligent, or physically bigger, the stronger one still wins.
The only way this changes is when the kids change, not the playground.
So, my feedback on RvR is leave it the way it is. With the added caveat that you add more avenues of PvP.
Thanks for reading, and I hope you take it into consideration.