So I'm playing jazz guitar for a year now. I know all "important" theory like scales, chords and their roles in a tune, etc. I used to practice hearing, like playing the first note and singing the other, singing and listening to chords and chord progressions, transcribing solos and melodies, figuring out chords by ear.
Now I feel I've hit a dead end. I now understand that "only" thing you need to be good at, in order to be a good improviser, is hearing a line or a melody in your head and instantly play it on your instrument. This is how I practice now: 1. Listen to music 2. Hear a line that I dig 3. Listen to that line for a few hours on a loop when I'm working 4. Get home and find the line on a guitar 5. Practice it and apply it on some backing tracks 6. Stop practicing it, but continue to listen to it on loop so it imprints in my aural part of the brain rather than to my muscle memory part of the brain.
I also play with people few times a week.
The problem is that this is very slow process and sometimes I feel that my musical mind is very clouded and abstract. Like when I have a guitar in my hand I feel that my fingers are doing more than my musical mind. It's not that I can't sing what I play, but I thing the melodies I create in my head are based upon the fretboard logic and not the music logic/musicality. Moreover, when I lie in bed audiating lines or melodies sometimes it takes a lot of effort to have a continuous flow of melodic ideas but sometimes it comes to me very naturally. The first one is much more common.
The question is how to I practice flow of ideas in my aural brain and how to hear them better (how to have clearer and louder audiation experience).