Do ENFps ever get really emotional (eg, expressing their heart, even tearfully) in private with their ISTps and the ISTps don't mind it at all? They can handle it, and even say "it is a good thing" because of the honesty/etc. ISTp of course will not "join in" but allow the ENFp space to process, until they find their own inner peace again, and then the ISTp is right there, able to rejoin them? (It's a support, just BEING there?)
Also, it has been said that INTp+ESFp often engage in mutual correction in a way that is mutually edifying. Do ISTp+ENFp experience the same? I'm not talking about naturally filling in for each other's faults - rather - being able to vocalize these things often and each takes it to heart in a good way.
Feel free to compare/contrast any of your assertions with INTp+ESFp duality, as it could be helpful.