When it comes to shredding I pick from the elbow. I´ve heard that it can be dangerous but if I play somthing damn fast for let´s say 20 sec. I only need a rest for 10 sec. to play it all over again and I can go like that forever if I want to and I never felt pain and been playn like that for 3 yrs. It may look painful (picking from elbow, I mean when I watch Steve Morse our Zakk Wylde I tell my self, man that´s gotta hurt and all that expression on theirs face and stuff like that) but I think you only need to be relaxed.
PS. By the way, this is my 100-ed post evrybody!!!
Dejan S. No speed limit