I'm currently doing something (and don't ask me what because I don't have a name for it) with an eNTP right now and he does some of the very things you described you entp doing too. Which is odd because he is usually calm under fire and all that. Kinda frustrating to me, but I've just been relaxed and letting him come to me on his own time, bwahahaha. That kind of sounds weird
but that's the best I've been able to figure out how to deal with him.
I think you should just relax and be yourself. Try to not project anything but how you would normally be around him.