Tuning Oloro Control

Hi! So this is my first time posting here. I've been working on my oloro control/ lifegain deck for about 6 months now. My playgroup has been moving towards more competitive decks. The strongest being a thrax control/stax deck, atraxa superfriends, and a prossh food chain deck. http://tappedout.net/mtg-decks/updated-oloro-control/ this is the most updated list currently. I know the mana base is less than impressive, but right now i would rather focus on improving the control elements of the deck. Im not overly limited on budget, but more expensive cards will take longer to obtain. The deck needs alot of work and I would greatly appreciate any suggestions/feedback