You mentioned going over and over an idea to analyze it, and this is fairly common with Mercury retrograde -- in the same way that Mars retrograde wants you to do things over and over again in order to get it right and 'perfect'. Same kind of energy, Mars on the physical plane and Mercury on the mental plane. Revise. Rethink. Try it again. Get it right.
Plus you have Mercury conjunct Pluto, which tends to think obsessively, and it questions everything, so here is more of that energy of going over and over something, maybe trying to take it down to its deeper meaning.
The square from your Moon in Aquarius to Mercury-Pluto tangles things up a bit more, adding some emotional stuff to your thinking, and making you thoughtful about your emotions. Both. Moon square Mercury could make for some impulsive decisions, but Scorpio and Aquarius are not terribly impulsive.
But you make decisions "too quickly". That could be a Gemini rising influence, because 'quick' is a Gemini byword. And your Mercury-Pluto squares your Midheaven, so maybe you think along the lines of "they're watching me and waiting for me to decide!" You're on the spot. So you cave to pressure and just make a decision.
Even so, your decisions are probably good ones, and probably are more reasoned and smart than you think ... maybe they just don't feel that way to you because you haven't finished analyzing!
You seem to have made excellent use of Mercury-Pluto in trine to your Mars, to have disciplined your body as well as you have. So I'm pretty certain you utilize Mercury-Pluto well in other areas of your life, too.