aaahhh - I hear you. I'm in the same boat... those things will come with time,

I think what you're missing is the "owning" feeling.. when you know what sounds will come with what positions on the fretboard. Here's what I try to do so I can plan what I'm going to play.. listen to the part you're going to solo over and start to hear what you think you want to do. It's tough to improv and be happy with it (at least it is for me). Once you have a good idea then you can start to piece things together. Don't worry if you start with things that remind you of someone else's stuff.. you'll tweak it to match your style and if you've only played other peoples stuff, that's what you "know" if that makes sense..

as for the pinch harmonics.. it takes a while to get those to happen just when you want. A little hint for getting them.. keep your finger close to the bottom of the pick, the harmonic comes from your finger more than the pic. when you hit the string your thumb should be just above and then graze the string.

Hope this helps! keep asking questions too.... everyone here is very helpful and I've made leaps and bounds of improvement from just asking a few very specific questions. As long as you're not going "hey, how can I play like SRV?"

good luck and keep practicing!! 5 1/2 hour practice sessions will do much more for you than 1 marathon session....