Govan is a great teacher:
Guthrie Govan - Guitar Techniques - Module 1 (Alternate Picking). Êîììåíòàðèè : LiveInternet - Ðîññèéñêèé Ñåðâèñ Îíëàéí-Äíåâíèêîâ
I do like it when you find a player like Guthrie who is absolutely technically amazing yet who is willing to be informative and helpful when it comes to aspects of technique like this. It's also awesome how he doesn't just suggest one specific way, or only the way which he does it. Like the pick angle, he mentions the ways are "both valid" and goes on about his day, all the while being so awesome, humble and laid back/casual as anything.