This is really interesting, I've had a quick go but don't have anything much yet, still trying to handle the first bend and the downhill left before the motorway :s
I definitely agree with maximising the exit, I find it's one simple thing to focus on when learning tracks that gives a lot of benefit.
I think that Nigel Mansell used to concentrate on his corner entry, with the view that if it is correct then the rest of the corner will follow. It's definitely worked for me in the past tho, generally I'll enter a corner a little fast by mistake, but somehow it tucks into the apex a little better and I've learnt a new line