First off, thank you so much for being vulnerable and letting us all in on your process. That's a tough step to take and it should be recognized.
As for the rest of the post, I think these are really good ideas, especially the new ammo rules. One thing I really like about these features is that they still seem to be really modular in that I could see someone forgoing them and not breaking the game.
The one thing I will say (and you're probably already aware of this), is that features like these do put a lot more emphasis on gear. As such, the gear list in the second edition will probably have to be pretty robust to make features like these really matter, which I personally think is a good thing. I think having a wide variety of gear is a way to add some complexity to the game while still keeping the core rules simple. I also think this approach fits very well with the Ito/Cairn philosophy of "fiction first" or "fiction forward", as gear is obviously something that players obtain diegetically.
I think it might be beneficial to develop optional rules for GMs to be able to homebrew their own gear as well, similar to the advice in the first edition concerning how to create NPCs and monsters and such.
Excited to see updates like this and looking forward to the next one!