Be careful starting a trigger cut like that above your bore cut. The wood can snap in a way that takes your saw for a ride with the tree. Seen a video of a 395xp doing just that. Also no reason to cut at an angle, all you are doing is increasing the amount of wood you have to cut to achieve the same thing. The less time you have to spend at the tree when its ready to go the better off you are.
Edit: I am by no means an expert, just try to be as efficient, and more importantly safe as possible. Don't want to see anybody get hurt.