It doesn't seem like your matchups are getting any better with your blue splash. Is it also appears you are losing to what should be auto wins (assuming big eldrazi is post or a variant).

So with that said, I don't think "counters" is where we want to be. The idea with my bdi parfait list is to ask questions because if your opponent doesn't have the answer they lose. That's a big draw to play an enlightened tutor silver bullet strategy.

Blood moon is better then back to basics. You are effectively switching out a lock piece for annoyance as B2B still gives at least a one time use.

Counterbalance is best with top. It may be worth a miser copy, but stacking your deck for it can interfere with the raw card advantage you get with tax. Rack for 7+ is going to better for you then setting up a single counterbalance.

Normally I would say cut all your non basics for basics. Make tax as powerful as you can. The difference with blue is that you get mana severance. Belcher + severance should probably see main deck, or at the very least belcher main, severance board. Colourless removal, a pseudo shuffle, and a win con for a single slot is worth it.

Detention sphere should probably be upped to 3 copies main. O ring is great game one by being versatile removal. It means game 2 you can side in to better specific hate without hurting you and still have a lot of generic removal as needed.

No supreme verdict?
No zuran orb?

That's all from a first glance.