What amazing pictures!! Your fish are beautiful. Thank you for taking our advice so greatly, we don't mean to put anything down that you're doing, we just want to help. It's so nice when a new member is open to change. Thank you! I started out with 1.5g for each of my bettas, and now I have divided 10g tanks which gives them just over 3g each. You will see such a change in your fish. Thank you for giving them a home and for doing all you could for the VT.
If you can, pick up a box of Aquarium Salt and Epsom Salt (found at pharmacies). Both are great for helping bettas get over sickness :)