I've used that style, and have saved it in a number of 12/8 slow blues styles, all of which have interesting flavors. It's the walk up in bar 9 starting off the beat after beat 3 that I haven't been able to reproduce. The closest I've gotten is to push beat 4 by and 1/8th. So bar 9 and 10 look like this |Am7 Abm7,^Am7|Cm7| Still not right though. I'm thinking this is really a triplet feel and that's why I'm not getting it, and I don't know how to add a triplet feel to two chords (granted, it is in 12/8 so it does have a triplet feel of sorts. If you listen to the ABB around :50 you'll hear what I'm talking about. https://youtu.be/Bqa1s4jhkQ8 On bar 12, I use D+ instead of D7 or D9, which is also the pickup chord for the song.