I think a lot of testing needs to be done in order to determine whether or not this deck can really perform. The mana base is unstable because it has more than one dual, essentially.  Mono U oath was less affected by mana disruption becuase it ran five basics and four fetchlands. Since green was only splashed, the four orchards and mox emerald provided all the mana the deck needed to get up and running.

Correct me if I'm wrong, but the orginal build was all about smashing face. It's an agressive deck with some control elements; thats what made it so strong. Addiding additional colors slows the clock, and makes it harder to achieve a quick win.

Control elements are certianly nice, but I'd rather have an akroma out first or second turn swinging for six than have a balance or swords to plowshares sitting dead in my hand.  I think the best defense is a good offense, in this case.

I'm going to have to agree with Diatonic, I think your deck is trying to go in too many directions at once.

I've been testing a version of oath with minimal black (duress+scrying) and it seems that the addition of even one additional dual land can mess with the mana base quite a bit.  Also, vampiric tutor is not a card I would play as the card disadvantage sucks in this deck.  Furthermore, why don't you just run echoing truth instead of StP and balance? Echoing truth can deal with spirits and platinum angel, that's the reason it was put in the sideboard of the original build.

It also seems like you should definitly be running 5 strips in the deck, to deal with fish, workshop, and other oaths. Maybe you could cut some intuitions?

All told 4c oath just doesn't seem like a viable deck.