That's interesting. I wonder if Capricorn (slow) keeps the Neptune energy more practical (along with the other positive aspects). Since it's in the H3 of communications, do you find that you have trouble getting to or making a point when you're speaking? Do people understand you clearly? My Mercury is in Pisces so I've had that issue.
Communication is one of my main gifts in life actually! I think I've turned Neptune into a helper even when it comes to communication. My intuition usually helps me get my meaning across to other people, because I can get a sense for who they are and speak to them in such a way that is natural for them. I also feel I'm gifted at explaining difficult things in simple ways.
Interestingly enough I wrote my master's thesis (Library and Information Science) about communication/information flow barriers and how to solve them.