With t squares that apex point can definitely be the release, or the thing that forces you to balance...I have an opposition in natal, and often attract someone that makes a t square to it... what I find is that their planet forces me to finally address my opposition. They trigger both of my planets, and I have to keep balance is probably more accurate.
For you, you always have this imbalance. Your Moon and Mercury struggle, and they are at odds. So ignoring houses, I would interpret this as a fight between your thoughts and feelings. Which one wins? Who gets the say? But then Pluto is constantly triggering this, and always has been. I would think in your childhood it would have created a lot of noise, a lot of aggressive behavior as you try to sort this out. I think today we would see this child as defiant and in detention a lot in school, or grounded a lot at home. But all It is is you trying to figure out how to balance. And knowing Pluto, nothing will stop you so parent and school efforts didn't really have an effect. (unless someone was keen enough to figure out what you needed was to be taught balance and how to manage your thoughts and feelings...)
I would think as an adult, if you have learned from this trigger, you probably can wield your thoughts and feelings quite well as a weapon- either 1) for you to easily and quickly determine how to get what you want, or 2) against someone should they cross you.
I see it as intense, very intelligent, and very determined.