Having the option to swing with one hige angel or attack with everything and get a hellrider trigger is great especially with aurelias fury in hand.

Sorry for rambling on your stuff but this deck is really good. Never even thought of stun sniper. Killer in this deck.

You could even dump all your searing spears and just run 4 each of lightning bolt and o-ring. There are many cards that will kill boros (sphere of safety, any eldrazi, etc.) O-ring does it all.

Best thing is soulbonding a silverblade with a sublime when the angel comes into play on turn 4. Play hellrider 5th turn and attack with just the angel. It'll be doublesteiking flyong exalted. If that doesn't kill than next turn attack with everything and a hellrider trigger should be enough to end the game. 

Oh and -2 skynight legionaire

So I would add

+2 vexing devil

+3 silverblade paladin

+ 2 sublime archangel

+2 hellrider

+ 4 lightning bolt

+ 4 oblivion ring (most important card in the deck. Its the only way to deal with an emrakul thats going to kill you next turn)

-2 searing spear

 I keep looking at this deck and thinking this could go competitive. I normally don't comment on ddcks but here goes. 

-3 viashino first blade

-2 tajic

-2 angelic overseer

-1 thundermaw

-1 angel of serenity

-1 lightning helix

-1 warleader helix