When do you like to do the DLCs?

I'm with you on getting rid of Omega ASAP.  Honestly, my dislike comes solely from being separated from my squadmates.

It's too bad we don't actually get to use that chessboard.  It's exactly the kind Sam wants.  That was a flaw but I guess that's what happens when DLC gives you something the main game wants.  It would have been nice if the DLC made these minor changes to the main game.  The chessboard is one and the knowledge gained from the Leviathan is the second.  I would also have let the clone survive and always have us wonder if we had the real Shep or the clone running around.  If Shep died on the Citadel at the end of the game, could clone Shep have taken over without anyone's knowledge?  In fact, that sort of thing could play into another MW ME game which could avoid Shepard's state of existence at the end of  the game.  There was no body anyway so anything is possible.

Ashes after Menae.

Omega sometime after Coup, usually a lot of fooling around then before Rannoch.

Leviathan after Coup.

Citadel after Rannoch.

Aria makes up for it though. Also I do it after Coup, Leviathan after Thessia, Citadel after Horizon.

To each their own. I loved Aria and Citadel but hate Pinnacle Station.

Yes, you can do From Ashes before heading to Menae but Javik isn't available as a squadmate for the Menae mission.