Hey,
On the bulky DD set, would you consider an EV spread of 244 HP/48 SpDef/216Spe?
The HP EVs give a leftovers number while the SpDef EVs increase your chances of surviving a Specs Draco Meteor from Latios.
Here are the calcs:
252 SpAtk Timid Choice Spec Latios Draco Meteor v 252 HP/0 SpDef Dragonite:
89.1% - 105.7%
252 SpAtk Timid Choice Spec Latios Draco Meteor v 244 HP/48 SpDef Dragonite:
84.9% - 100.5%
The speed EVs remain unchanged and I don't think Dragonite minds losing those Attack EVs although I'm happy to be proven wrong.
Are you considering Multiscale?