- contemplative, reserved, shy, slow moving, but slow and steady wins the race (my wife describes herself as a 'plodder' but she gets there in the end, even if I or others fall by the wayside). Loves the status quo (not the group LOL) tends to put off things, and prone to inertia. Loves food, likes home, feels comfortable with the familiar, so tends to visit the same places. Phlegmatics tend to get on well with everybody, except other phelgmatics - because of the awkward silences, but all other types tend to be quite happy to do the talking.
My wife also has strong psychic phases, so sensitivity is to more things than other people and their moods
I just wanted to say that I found your analysis based on temperament very interesting. I had never seen it done that way before, although I had seen you talk about it.
I don't know many Capricorn people, but the ones I know can actually seem more tough than they actually are. My idea is that an Earth sign with a lot of Water influence could be a bit like Earth with a lot of Water... when you look from far away it seems stable and unchanging, but try walking on it and you may find yourself a foot deep into the mud. What I mean is that either they may feel like they move slow through the water-influenced parts of their lives (you'd have to see the Houses), or make others have this impression, that they get nowhere (specially emotionally, since we are talking about Moon and Venus).
However, I have to say that although Scorpio is a water sign, it is so intense that all this 'still' appearance could be hiding a fast river underneath. I'd look at his Asc to see if the water influence is that intense or if you have more factors that can stabilize it.
My knowledge of Astrology is very basic yet, so I apologize for not offering a more objective reply. Since you talked about the elements, and I happen to work with these very often when reading playing cards, I thought I could give my 2cents.
And Minderwiz, what did it take for you to woo her? Lol. I guess the cat's out of the bag now that this is someone I'm interested in whom I think is interested in me as well (but how, oh how, can you tell with Capricorn/Scorpio combinations? They're nearly impossible to read.) but all that water has me a bit nervous. I'm a Gemini ASC, which makes Sagittarius my DSC and I definitely have foot-in-mouth/wish-I-hadn't-just-said-that tendencies! I know anything can work with effort, but it's still fun to speculate what the best approach is.
I'm Sagittarius with Sagittarius ASC, perhaps I am the biggest foot-in-mouther in the whole universe?
You can feel better now, lol!
Water signs do not make me nervous, because my mother is Pisces Sun and Moon so I kind of grew used to that *sigh*. They
appear to be much more frail (or evil or unstable or whatever façade they use to manipulate you into doing what they want, lol!) than they actually are, and sometimes I think they get a thrill out of it. Tsk tsk. I do think a Capricorn will be strong enough to handle whatever your Sagittarius-big-mouthness has to say, although the Scorpio tendencies may not like it (it always seems to me that Sagittarius and Scorpios don't get along very well). But nah, they will not break, in the worst case they'll give you the Killer Look.
(This whole paragraph is a bit of a joke, I do not mean to offend any fellow Water-sign ATers!) 
Besides, I'm sure that a DSC Sagittarius (if it's all you have in Sagittarius, and your Mercury is not roaming in the solecistic parts of the natal chart) won't make you such a huge foot-in-mouther.
As on wooing techniques I am sure Minderwiz knows them better than me!
Now if you were talking about something else, I apologize for sticking my big nose!