LF brake hanging up?

Its 10" MB drums on my 71 dart, i re-built the wheel cylinders last month, they were both leaking, now the LF (drivers side) is dragging enough to get the rim warm, i loosened it up & it helped, but its still doing it, the RF is fine, what should i look at, could it be the cylinder? I've never seen/had one hang up like this, now calipers on the other hand, can i rule out the MC or air in the lines??