Hey all my turn to join the discussion now and I wanna thank everyone who took their time to involve their opinions and hope more people take their time too to solve this problem we have right now.
So after reading this wall of text and analyzing it I've come to my personal solution to this taking into matter what everyone has said.
I think that the main problem here is not the DKP system in itself, the problem is the Sunday HC raids which right now is DKP heaven. The thing is that we do have a core group where at least 90% turn up to every mythic raid and other than that we do have a few somewhat full HC geared reserves, which means that we don't actually need to go HC anymore in my opinion as we do have the amount of people we need ready to raid mythic already (including reserves).
However as Quh is saying it's always nice to have more extras, BUT my opinion about this is that if someone REALLY wants to join us and compete for Mythic spots with our core raiders I think that these people should take their time to gear themselves up via the very very easy Group Finder system. That means that if you wanna start raiding with us you do need to put some work to get your spot. Back in the days our goal was to welcome everyone to all of our runs, but these days we are 4th ranked on the server and if we sharpen up we could make it to the podium at the end of the expansion, but to reach this goal we can not spend time boosting casuals with 700 pvp ilvl in HC just to stand a chance on Mythic loot.
To clarify my point I just want to agree with what most raiders have stated before me, that DKP and the sunday HC raids should no longer be bounded together. I think that what Yi said about using sundays to do fun runs like BRF Mythic is a nice alternative but to add to that I think that maybe we could do HFC HC every 2nd sunday and something else the other ones.
The main point is that if we are going to keep the DKP system I think that we must stop rewarding DKP in HC as we do not need it anymore according to my own opinions as stated above.
This means that DKP is purely awarded when you are raiding Mythic with us, and in order to be raiding Mythic with us you should be almost full HC geared (which means you've taken your personal time to get ready for mythic instead of relying on 15+ other people boosting you every sunday).
I however do think EPGP / Loot Council would benefit us the most but to meet halfway to keep the DKP system that is pretty good after all we need to stop rewarding DKP in HC raids.
As Quh has mentioned DKP system rewards attendance, so if we only reward DKP in Mythic this means we reward the people who actually join us in the important runs and stay with us wiping on the same stupid freaking reason for nights instead of rewarding the people getting pretty much boosted in HC more than the real fighters.
And other to that I think that posting a personal BiS list even with DKP would be a great idea. This might solve problems like the one Yi mentioned in his first post about the Hellrender which is BiS for DK but lower ranked for wars/paladins, where people can use their common sense and not outbid a DK for a DK BiS item if you're not a DK. This is just my own personal suggestion tho.
I do not have a solution now and here for how to distribute the HC gear to people if we stop DKP in HC though, but I guess a traditional /roll could work with exception to a few reserved items to super core raiders still missing that 1 specific item in HC. But the HC raid will probably suffer and not be as smooth, but at this point and time , 20 weeks of us clearing HC I do not think that clearing HC is a need no more and the people who still need HC gear to get a spot should take their own time to do this as also stated earlier.
To sum things up this would mean that DKP would only be awarded on the wed, thur and monday raids where we raid Mythic. Keeping the DKP system can work but I think that we will have to stop rewarding DKP in HC for us to stand a chance on getting Archimonde some time soon.
This is my personal thoughts right now and my head is full of ideas, i might have missed quite a few and maybe explained some of them bad so please add your thought to this.
Hope that people keeping adding ideas so we can solve this asap =)