Just a wild suggestion here; does your opener have the soft start feature where it starts slowly then picks up speed? If so it might be starting too fast. Also, the torsion springs do need to be lubed once in awhile but I don't know how lubing the springs would help you in this situation.
The first opener on my 16wx12H shop door was an old T rail chain type opener from a standard garage door that I rigged up with sprockets to turn the torsion bar. It worked but was not a soft start or stop so I had to set the door so it was not completely up to keep a pull on the cables when it stopped. I rarely need the full 12' height of the door so it worked out OK for me. I seem to remember if I had the door putting too much down pressure on the torsion bar the opener would free wheel backwards making the limit switch jerk the door back up again. You are right about making a big mess when the cable slacks and comes off the spool.
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