Do NOT, repeat NOT use the Tri-chlor tabs! That was terrible advice. Your pH is 7.0--on the very edge of too low and Tri-chlor will push it down, making it worse. Your CYA is 35 which PERFECT and the Tri-Chlor will push that up, making it worse as well!

The 3 gallons of 12%? How big is your pool? I have 20000 gallons and two of those would raise my FC by 12ppm! Still, it's not TERRIBLE advice, unlike the Tri-Chlor, excessive baking soda, and useless calcium.

Your T/A is a little low, but I think 5 # of baking soda is too much. Start with 1 # and then measure. If you are between 80 and 100, you are DONE and don't add more.

Calcium is a TOTAL waste of money! You don't need calcium in your vinyl pool! If you MUST add calcium, buy Cal-Hypo and use that--at least you'll be getting useful chlorine for your money and the calcium will be essentially free. If you need calcium or don't care about calcium, Cal-Hypo is a better source of chlorine than Tri-Chlor or Di-Chlor as it doesn't affect CYA at all, and has less effect on pH.