First, allow me to remind you that you guys are fighting over 10-year-old content on an emu server that, quite frankly, could be shut down at any point by Sony's legal team.
Having said that, all it would take is the GMs to enforce the raid rules consistently and fairly with the threat of bans/guild disbanding/whatever heavy-handed approach they want to take to make sure that the consequences of training/leapfrogging/whatever is SO GREAT that the guilds are fighting to make sure each other gets their fair shot before their own guild makes their attempt out of pure fear of being dealt with by the GMs for not "playing nice".
I don't care how the actual mechanics of this happen, but in my mind it would be a version of:
a) Guild A demonstrates ability/intent to raid target X first and claims one attempt on the target. Screenshot this with a timestamp in case the proof is required later to settle disputes and determine who needs banning/guild disbanding.
b) Contesting guilds (B, C, D,...) stay the hell out of the way until that attempt is complete. If a guild cannot demonstrate the ability to do that, they should be guild disbanded. This will put them in a more cooperative mood. Also, three random players on each guildmembers' friends list should be banned.
c) Raid leader from Guild A concedes defeat and contesting guilds attempt the raid target *once* in the order in which they demonstrated ability/intent. If a guild cannot demonstrate the ability to concede defeat when they have wiped to the point where they can no longer engage the raid target, they should be guild disbanded. This will put them in a more cooperative mood. Plus all of their rare items/weapons/armor should be removed from all their toons, and their characters should all be turned into assling druids.
All guilds present and attempting to demonstrate ability/intent should designate one raid leader via /shout, and only those raid leaders should be communicating. If they can't work it out between themselves, ban all of the raid leaders. This will put them in a more cooperative mood. Plus go to their houses in real life and leave bags of flaming poo on their doorsteps.
Trust me, everyone will be tripping all over themselves to cooperate.
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