What techniques do you use to minimize the risk of buckle extrusion or infection, especially in younger or highly myopic patients?  

No different techniques. Make sure you soak the elements in saline with an antibiotic. Do not touch the buckle with your hands. Do not use instruments that can damage the silicone. Extrusions and infections are not common. Kids have a healthy Tenon that will keep buckles from extruding. Also, buckle...