Is it true, in fact, regarding the manner of my standing in prayer when I make my feet level and separate them slightly, despite the whispers of Satan that one of my toes is not level with the other?

"Leave off the whisperings and do not pay attention to them. Your prayer is valid regardless of the posture you stand in, whether you join your feet together, separate them, or alternate between them. The Sunnah is to separate the feet and alternate between them during a lengthy standing. Advancing one foot is disliked, but it does not invalidate the prayer. Know that indulging in whisperings leads to a great evil."