shrang have you tried using DD as a way to power up EQ, allowing it to beat common checks and counters, and to allow Latios to clean up late game, while at the same time keeping Latios's role as a special attacker and revenge killer against almost anything unboosted? I don't think that Latios needs such a large Atk investement and i am not sure abut D-Claw and Outrage too. I mean without Draco Meteor or Dragon Pulse you are losing so much potential of Latios in early and mid game. Latios can't revenge kill anything except for Pokemon 4x weak to its coverage move and Dragon-types with your set. The set i have in mind is this one:
[SET]
name: Dragon Dance
move 1: Dragon Dance
move 2: Draco Meteor / Dragon Pulse
move 3: Earthquake
move 4: Hidden Power Fire
item: Life Orb
nature: Naive
evs: 160 Atk / 96 SpA / 252 Spe
The EVs allow Latios to always 2HKO 252 HP Ttar and Jirachi after SR and always OHKO 248 HP Heatran without SR. Then the rest are thrown to SpA for as much power as possible. Even with 96 SpA EVs DM still hurts and can revenge kill a whole bunch of stuff. Here is a useful calc:
- DM vs 4 HP Keldeo / Terrakion: 89.5 - 105.86%, 75% chance to OHKO after SR
And those two are some of the most bulky offensive Pokemon in OU, meaning that anything frailer than them (most offensive Pokemon) will get OHKOed by DM after SR. At late game, you can still get two kills if your grab a DD, one with EQ on the opposing Ttar, Jirachi, Heatran or whatever, and another one with DM, which is pretty cool imo. Dragon Pulse if you want to have a higher chance for a clean sweep, but you are gonna need a lot of entry hazards to make it work, and again Latios becomes a lot less threatening in early and mid game.