Rhox War Monk got boarded out every time, except vs. 1 zoo matchup. He's great there, though. He feels like a fine game 1 card that's easy to board out for more specific hate after game 1. I have not played vs. burn or a Delver list yet, but he seems good there.
Geist and Rafiq have been all-stars. They naturally play well with Retreat, and KotR can find Kessig Wolf Run to push Rafiq damage through. And with all the exalted in the deck, sometimes 5 or 6 power + double strike just happens to be good enough.

I have indeed had to ship a couple of hands due to double colorless sources(and the hand would have been fine if either was a green source), but I'm unwilling to give up either of them just yet. The mid/late game functionality is too powerful. Titan can get Stomping Ground + Sunhome when he enters, which presents at least 12 the next turn, while turning all of your 2+ power creatures into legitimate threats if he gets removed. Slayers' Stronghold combines well with Ojutai, but also allows Knight to attack and pump herself.

If I had to cut one though, I would cut Slayers' Stronghold. Of course, everything I say has to be taken with a grain of salt as I've only played the deck for a week. More testing is always useful.