I have also been listening to some of the blues standards again. I have been tracking down the recordings that are in the Abersold book. I like Cantaloupe Island. Downloaded it so its on my MP3.
I can hear the chord changes better and follow the ii, V, ! progression. I can understand the raised third can be used rather than pentatonic scales.
Practicing scales and melody. Having played the melody the feel of it seems to stick better and then its more possible to improvise.