One official and two eyes watching the ball handler is enough. When you establish what contact is and is not allowed, don't vary the rest of the night. The players are looking for direction, and they likely will go as far as you let them when it comes to contact, or even conduct. However, the players need a consistently called game so they can adjust to what the officials call. Coaches can prevent nearly every bench or player technical foul from occurring.
Officials have the only authority for the manner in which the game is called.
Understand, there is an alternative after the game to avoid those officials which are not suitable, but sitting in the locker room after a second technical foul is not a tolerable option.