Hey Josh--
I'm so glad that any of my VI madness has been a help to you at all. Often, I feel quite alone with learning these interfaces. Many have rightfully asked for FXP or AUPRESET and MIDI files to see *what* was done and *how* it was done, but I'm often left wondering **why** certain choices were made instead of others. There is no one right way to do anything, but exploring the options has always been something of tremendous interest to me.
For expression, I usually set aside a few hours at the beginning of the mix process just to experiment with drawing in different expressions directly into DP. I've never done this with Logic, but in DP I can just draw in any random CC curve more easily with a swipe of the mouse. If it doesn't work musically, I can just draw over the old curve without worrying about the "undo" features. (Not that Logic is not as effective in this regard, but I just find DP easier to use, especially with editing and mixing.)
Another thing I've found useful is a trick when trying to make a convincing crescendo with one line:
If I want the violin 1 to crescendo, sometimes it's effective to first ramp down certain other instruments *slightly* for the first part of the crescendo. This tends to be lower instruments which take up important mix space. Sometimes, I'll just ramp down the contrabass a little to make space for the forthcoming crescendo. Depending upon the effect you want, you can can ramp down the other instrument(s) for the first 1/4, 1/3, 1/2.... 3/4 of the duration of the crescendo. Then, begin (or overlap the start of) the violin 1 crescendo. You may also want to ramp the other instruments back up to support the violin1 crescendo as it reaches its peak. The later you start the violin 1 crescendo, the more dramatic the effect will be. The earlier you begin the crescendo, the more subtle it will be.
Often during an overall crescendo, instruments will actually decrescendo over a note or two before continuing the actual crescendo. The resulting curve will look like a rising wavy line. Again, the circumstances dictate the effectiveness of this trick, but when in doubt I always isolate the problem by opening a blank session file to work on it outside of the project session to really nail down details with certain phrase shaping quandaries. I've found that experimenting "too much" within the context of the project psychs me out, and I often find myself starting a project over when I paint myself into a corner.
A composer uses a skethcbook. An artist will do studies and premix paints and test them on a separate palatte or canvas. It seems reasonable to adopt the same "scratchpad" technique for VI.
You mentioned that the perf-leg_sul patches tend to get a bit more like portamento up top with certain intervals. This is true, depending upon where the default controllers are set upon loading them. The cool thing about this is that you've discovered another way to put in an effective portamento without using an actual portamento patch! There WILL be situation where you will need that effect one day. That's why I've been keeping a physical notebook of patch and matrix behavior, organizing it according to articulation. Instead of putting the perf-leg_sul patch only in my notebook's legato list, I'll also put it in the portamento list as a more subtle articulation with this effect. It's not always something that will occur to you at the moment you actually need it, but having a list of patches/matrices with some benchmark controller settings is always nice to refer to days or weeks after you've made the initial discovery. If nothing else, it saves on tedious searching through the samples to re-audition sounds you've already stumbled across.
Onward and upward, eh?
Cheers,
JWL