It sounds like you're over thinking it. You can have good body position anywhere you ride. You aren't going to have the same sensations rolling around a parking lot as you will have at speed, full lean, etc. Personally, I don't think that they will translate. Smarter people should chime in.
Pick one thing to focus on each session, and go out last so that you have some open track. I suggest things like: 1) your contact/pressure points on the bike (I use light on bars, heavy pressure thigh on outside of tank, stabilization with feet), 2) where you are looking and when you are looking there (early), 3) your ability to move on the bike without upsetting the chassis. Start there...and get time with a coach!
As a coach, what I see from riders consistently are (in no order but many are related):
-weight on/off seat upsetting suspension (you'll never "feel" comfortable and there is a risk of crashing)
-much less hanging off than they think (look at pics of yourself, if you can see dash and your butt is on the seat, you're in the middle and carrying more lean angle than you need to)
-much more lean angle than they think (dangerous and frequently related to not hanging off the bike)
-constant adjustment of direction with inputs at lean (danger for tire grip and to other riders)
-body/head aligned with bike instead of to the inside/forward
-tight grip on bars, frequently hanging on them to stay on bike (potentially causing front tire to give up and subsequent crash)
-not looking far enough ahead (once you start looking far enough ahead, you wil be amazed at your later braking, earlier acceleration, and faster corner speed)
These types of things affect the package (bike/rider) differently and vary from track to track. This is why you need the whole toolbox to be proficient while going from track to track and in varying conditions. CMP, VIR South, and NC Bike really reward looking far ahead. CMP will require smoother inputs and being lighter on the controls compared to Road Atlanta.