Believe it or not, my situation is quite difficult.
No, it isn't. Your long term might be, your short-term isn't.
Short-term: Pick a random big guy. He is the one who must leave.
Deactivate the account.
Send a mail to let him know why it happened.
Every big miner will have a backup in their config.
One miner must leave either way, so why not make a fair dice roll.
Long-term: Close registration until you are <=33%.
Sorry but I will not tolerate such issues over a longer period of time.
Currently there are 2-3 big miners on Coinotron. If I drastically raise fees I will lost them and half of smaller miners - not good.
I've chosen different way: dialog. Right now I'm talking to the biggest miner. He promised to switch part of his hashrate either to doge pool or to other LTC pools in few hours.
Good if it works, see above if it doesn't.
My goal is to bring down Coinotron's hashrate to about 40% which should be win-win solution for my pool and network security.
Still too high.
<=25 is "nice", <=33 is a must.
Yes, profits and such, but not on the back of the community.