well its gonna be hard to get ableton to follow midi clock , its kinda doesnt work very well because you are trying to force a quite loose timing system (midi) onto something much tighter (audio samples),me and a friend do an ableton and decks thing but we keep ableton at a constant tempo and mix the decks into that.

i have tried to sync a lot of different stuff together , when you force an audio system to sync to midi its allways problematic.........in my experience anyway. (its why sx doesnt sync to clock only sends it)