Hi man,i am the one that made the mixed Dialga anlyses.I tested your set(with enough evs to ohko even bold Chansey though)and you were right.It is better!
I will put your spread as the main set if my analyses gets unlocked because great sage locked it...
We gotta fight for the RU tour. I'm GMT +0, and I'll have most afternoon to make the battle. Fortunately most of the time I have classes in the morning. ;P