All I have to say to you is don't switch him to live. Avoid it unless he refuses to eat F/T and begins to lose weight. Hooked on live is the last thing you want, it makes switching to F/T in the future more difficult. Plus, when you feed live you risk an injury to your snake. There's just no need to feed live.
What are you using as a heat source? If you're using a heat pad make sure you've got a thermostat, too. Oh, and you might want to bump up the humidity when he sheds, he may have issues shedding at that percentage.