I think the best thing to do is to focus on an aspect of your casting first, then progress to others. That way you won't have ten things going on at once which may make it hard to pick out the most important, etc.
Let's start with the application. You are clearly a universal angler, so I couldn't begin to guess - but let's say you wanted to work on tightening the loop to cast in wind (as a striper guy) or curve casts with gentle landing (on the Deerfield) or quick loading accuracy (for Andros).
Casting in general is about generating, directing and releasing forces. How these kinetics are to be applied is what leads one down a specific path of discovery.
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum