Introductions discussion

Greetings to all kinksters who are either locked up or holding the keys! I am the Keeper of the Bear. We first entered the world of chastity in December 2015 with not much information, but we lasted a week and it went quite well. It was good enough to try again, yet this time I have some concerns and questions. My husband usually acts as my Dom/Master, but deep down we are both switches. He possesses a strong, dominant personality while generally being a crab 24/7. My main worry is that he has the desire to hand over power and submit to me, yet he mostly “tops from the bottom.” This completely undermines my confidence because I take it personally as if I am not doing well enough at taking control so he feels compelled to step in again. He wants this dynamic from me, which I don’t mind practicing; I just lack full confidence in myself and the role for now. On another note, he wrote a wonderful letter declaring his wish to submit and be locked up. He wants me to “break him” and prove that I am in charge. The only method I know how to use is impact play, bringing out bruises and welts. I am sure I can do this; it’s just that I doubt he truly understands what he can handle. I simply need advice on breaking his habit of topping from the bottom and learning to be more confident as a key holder. Any friendly advice is appreciated!