That could turn into a resource hog; monitoring the signal meters of the tracks can take up some cpu time.
Alas, not too sure I grasp your question; what are you puzzled with? How to monitor certain track properties or how to control them ?
You already mentioned that you were able to control the sends, but "didn’t like more than once instance" eludes me. You can easily control more; just add the right live.remote~ (or live.object) objects, point them to the controls you wish to control and start feeding the right values.