Why do all my moves work with Advanced followers but not with partners at my level?

It’s most likely due to the Advanced followers being able to adjust and adapt to your issues and bad habits. Advanced followers can compensate and course-correct imperfect leads whereas a lower level follower will actually be more authentic in doing exactly what you lead. So, consider those lower level followers as your training ground to refine your leading skills. They will serve to verify your leading effectiveness. Consider that if you can’t lead a move consistently successfully on every dancer in the room, you haven’t finished learning it yet.