You can absolutely save those plants although you may have stressed to the point of hermie. If it were me here is what I would do.

1. Flush with 3x pot volume. 3 gallon pot needs 9 gallons of water although You can get away with 7 gallons... Check soil pH at runoff with the first gallon and adjust pH upward/downward if need for remainder of the flush. Check again at the end.

2. Straight water for 7 - 10 days. No nutes.

3. Once you see healthy new growth you can resume feeding @ 1/4 recommended strength. The burnt/damaged leaves will never recover.