Ah okay thanks for the clarification! Live's midi implementation does leave something to be desired but I haven't run up against any issues with its routing that couldn't be solved with the loop back technique. It's so long ago that I learned that trick that it's second nature now though I do remember being frustrated with it at first.
I generally have Looper's first loop setting Live's tempo. If you tell the device how many bars the first loop should be the tempo should be fairly accurate. But I don't know how others are using it.