Sounds interesting! Firstly, I'm excited that your post is not about the generic "Is poly morally right? Monogamy can't work! OMG we're poly!" it is about 4 people trying to make a relationship work in a way that is meaningful to all of those involved. period! Its a subtle nod at the lifestyle which I presume is becoming less of a 'big deal' so people can focus on the important stuff, not the semantics! Yay! Anyway on with the show: Without really knowing any of you, my knee-jerk reaction is to say that your sensitive Fe makes you worry about and feel responsible for maintaining 'happy group cohesion'. Since you're married to an ENFP you probably usually get good constructive feedback about how he's feeling, so you can relax with that feeling of 'win-win' more easily... Now you add a couple of Thinkers in to the mix and it gets tricky! I'm married to an ISTJ, and in many ways I feel like we became overly "enmeshed", and it has been difficult for me to separate out my own feelings enough that I can go out and have a good time and feel happy even if she is in a bad mood or just wanting to stay home and read a book... Some might say that is 'cold' or 'selfish' of me, but I really like what Kahlil Gibran says about having space in your relationship. Check out his poem on Marriage in "The Prophet": The PROPHET, by Kahlil Gibran It may be possible that the two new people in your relationship can be very happy and content and don't even have the same concept of a "win-win" as you do. I know some INTPs that are very self-contained and can do quite well and be content in a situation that might drive a more stereotypically 'emotionally close desiring' person nuts! The INTP might not even notice if they're busy in their own world doing their own little projects... It doesn't mean they might not come out and enjoy some physical closeness and be totally satisfied... Likewise the ESTJ is probably used to "being the boss" in her relationship, so naturally she should "take care of things" for you guys too! haha... She might be well meaning in fact and wonder why you don't appreciate her efforts more!
So I would almost tell you to focus on the good things you get from these important people in your life, try to overlook the annoying things (cuz we all got dirt, and they have to change themselves), and hang out with some friends outside of the group to keep your sanity!
Sounds like a normal marriage! haha... Now if only I could solve my own poly problems instead of dispensing questionable advice...