Don't be afraid to take control, you are the boss. No DP, should be disrespecting a director on set, if there is a problem he should pull you aside and talk to you like an adult. As for the AD if she agreed to work for a certain rate, and now she wants more, fire her on the spot, they are a dime a dozen. Anyway check out my website (www.johnnyderango.com) and when you are ready to do your next project and you need a director friendly DP give me a call.