I am not sure how you use the e-collar in Schutzhund or if you use it at all. There is a school of thought (Hillmann's methods) that use a very low buzz (low 2 on a Tritronix/Garmin) and use it to reinforce the RIGHT behavior thus conditioning the dog. The other school is to use a higher level to punish a dog for giving in to behavior that he knows is incorrect. (Thus, being fair to the dog requires a lot of skill since you really have to be sure you know the dog's mind.) This would typically be what we would refer to as the Lardy method (though actually it goes back to the father of the e-collar and training wizard Rex Carr. Many outstanding pros use variations of this method. Lardy, Graham, Farmer, Dobbs, etc.
I think Hillmann's method makes most sense to me and is a bit more idiot proof. Hard to screw your dog up with a low buzz. Plus I'm seeing good results.
You can get a flavor of what Hillmann is all about by going to his youtube channel
https://www.youtube.com/user/hawkeyemedianet
(PS: If ONLY there were HT's within 2 hours of me. Hell! I drive that far to just train my retriever on water most of the summer.)