Ive been banging my head against a wall on a Robben Ford style backing track for weeks. I really can't seem to execute much at the tempo of the song, which isn't super fast anyway. So today I played over it at 80% tempo and my shlt got better pretty quickly. Not great but, I hear a rapid improvement. After maybe a half hour of jamming at a slower tempo I sped it back up and was much less sloppy. So, while its obvious to work on things slowly, it never occurred to me to improvise over a slowed down track. Hope this Mr. Obvious tip helps someone else.