The issue you seem to be having is related to lockout of elements like Magnesium, Calcium, and Potassium. The problem may have passed if the issue is not getting any worse.
Focus on stabilizing the pH of the media and eliminating any residual buildup. Sensi A+B isn't really an organic nutrient and IMO is not suited to soil in the slightest so I'd recommend maybe saving that until you get into hydro.
It would be a good idea to top dress the soil with some crush dolomite garden lime and water through that at 6.5 pH. The lime will provide micro nutrients to the plant and create a cal-mag pH buffer to help keep pH swings to a minimum. I would use 1tsp of crushed lime per gallon of media spread around the top.
Don't do anything drastic at this point. Just focus on the new growth and keeping the pH, calcium, and magnesium levels in balance. Avoid the nutrients made from salts and find yourself some organics for bloom. The FFOF should have enough food in it for several weeks of life, if not, then you can always top dress with a little organic compost and water through to provide your microbes with a boost.