I have no idea about mechanics to know if my method is correct. I put x amount of mana into my conjuring everytime. For instance 1001 mana into every angel or archon. From doing this I'm either gonna get the best or the worst. With this in mind, I believe the veil and RNG have sway, in addition to edges and charisma. I'm also guilty of rebinding a lot. Rebinding is such a bitch. If I was an immortal I would hate to snoop me doing it because its pure spam and guessing. Like trying to touch the ceiling through a fan without getting touched. But it can be done.

Hope that helps.