Allow me to disagree. The main reason for failing with Angels is that most rituals are structured based on wrong assumptions, like the ones you mentioned. Angels and Demons or any other spirits, follow the energy you give them in the ritual. If the ritual is powerful enough, you’ll see powerful results. Perform a weak ritual and no matter which spirit you work with, you’ll see weak results or no results at all.
Most GoM books, especially the ones by Damon Brand, are structured in a specific way that may or may not work. Depends on the situation and desire. The reason for that is the “emotional transmutation” technique. If your negative emotions are stronger - the situation is really bad or you have a strong desire - then the situation will become worse or at least, nothing will happen. There’s a reason why occultists and magician only concentrate on the end result. This “transmutation” thing is gambling and playing with fire.
Unfortunately, because almost all their books are attached to Angels, people get the impression that Angels are just difficult to work with. They don’t care, you need pure heart, must be religious etc etc all are superstitions and got nothing to do with how Angels work.
Angels are soldiers, especially Archangels. Give them weak, all love and light, ritual and you’ll be lucky if they do anything at all. Forget that they’re “Angels” and act as if you’re working with a Demon… and see what happens. 