Well, you shouldn't be firing in Full-auto mode unless you're playing a renegade field. Even then, only do that when you're just wasting paint.
And, the Angels, like most guns, will have their own personalities, so your best bet is to just try settings. Stock dwell should work, unless you have upgraded internals (ram, bolt, etc). I would just recommend you stick with a ROF of 20, or better yet, 15, as most tournaments won't let you cap be much higher than that.
Christ Krew #17