Buddy, I'm not a master grower or anything and to be honest anyone who calls themselves a master grower is an idiot, but I do know a little about organic growing, not only of our special plant but also fruits and veggies. I have some advice for you but take it for what it's worth.
1. Stop smoking pure sativas, they aren't for everyone and certainly not for me given my temperament and they don't seem to be for you because you seem like a worrier. I smoke max 40% Sativa crosses and at night almost pure Indica. With your medical problem you have, Indicas will suit you better anyway. Plus pure sativas are a lot more difficult to grow and Indicas a lot more forgiving!
2. Don't give up on your organic dream!
3. Sunshine mix is basically just pure peat with some perlite if I'm not mistaken. I live in another country so I use good bagged soil from here and amend it and cook it for 8 to 10 weeks before I use it. In the states I'd use roots organic or fox farm cut with light warrior
4. Dont overthink things.
5. If you want just a water only soil use sub cools recipe...just to start until you get your confidence back.
6. Tad from kis is a great guy and I'm sure his soil works fine if you want to try it however it would be a shame if you spent all that money and then scraped the idea.
7. Scratch in a half tablespoon of Epsom salts to the surface each pot of your current grow
8. Stop overwatering! In your setup a quart and a half of water every two to three days should be fine.
9. Start using aloe Vera in your waterings. It helps the plants roots no end.
10. It's sort of hard for me to help a lot this late in on your current grow but the main thing I see is you need to get more suitable genetics. I can help a lot on your next grow from the beginning as it's easier to start with a new soil.
Please just relax and whatever will be will be. You will get there...it's going to take a little time but you will!
P.s. After this grow you are going to have to take down your tents and wish them in insecticide and also clean out your room with the same insecticide, clean your lights and ducting etc....don't take clones from anyone and grow only from seed if you want strong plants. Don't let anyone in your room that works outside all day unless they have been home and have showered and have clean clothes on.
Again, please chill out and stop smoking all that Sativa brother...it can drive you crazy!