Agree with everyone else. Keep the GTs and Jacks. They should be fine together in a 180, just give them a lot of sight line breaks and more hides than there are fish. Might want to have a divider on hand for breeding times or after breeding time (males can get a little pushy before females are ready), but I've never had either a GT or JD that became a murderous monster in a tank that big. That RD/Midas is going to claim the whole tank when it's grown and kill anything it sees as competition and then the rest just because.
Agree, I have kept all the fish you mention, or reasonable facsimiles of each genus
and agree your best bets are maybe the GTs, and JDs together in the 180, maybe with some non-cichlid, large/fast dither species to attract attention from each other.
The motaguense with Amphilophines in a tank as small as a 180 is a disaster waiting to happen.

These species each need single species 6 ft tanks of the own

I have two 180 gal tanks, and would never dream of putting those predatory, and territorial species together in that size tank.
In one of my 180s I have successfully kept 4 Andinoacara coerleopunctatus (smaller close cousins of your GT) but started with 12, and the alfa male hunted down, and killed all other males and few non-receptive females in that size tank when maturity and territoriality.

Even in nature, JDs seldom do well with other more dominant species in the same area.
Below note how torn up the JDs in the video below, they are in an area with more dominant uropthalmus, and this is in thousands of gallons.
027 zps4b102ffd
But below, a larger Cenote where JDs dominate, and share the area with only live bearers, and a few catfish.
Eden2