I think we should give our spinners more time to adjust to the condtion. In 20/20 cricket, spinners are the main weapon (recently concluded IPL is one example).
We should go with 3 pacers [Mash, Rasel and Rubel] Shakib will be our 4th bowler. Riyad & Nayeem the 5th. Mushy or Mithun can be our 6th bowler