What is the best next surgical approach to manage severe inferior oblique overaction and superior oblique underaction after inferior oblique myectomy?

Persistent superior oblique (SO) muscle underaction after inferior oblique (IO) myectomy usually indicates an abnormal, loose, and floppy superior oblique tendon. At surgery, the first thing to do is traction testing of both oblique muscles to detect tightness or laxity. Videos of the "exaggerated traction test" are available online or on PubMed as published originally by Guyton. I would expect the SO to be very loose. The IO should feel loose too unless the myectomy missed a portion of the IO. ...