From everything you said here is what I think happened. You fertilized and the heavy rains came. When it rains the plants uptake of the fertilizer increases. Plus the soil was probably too wet. Double whammy.
When the plant gets to much fertilizer and the soil is wet and then the sun comes out the leaves will burn. Happened to me before. you can try to shade them when this happens. I think those plants will survive, they are still green. I have seen plants in worse shape survive. But you can't go wrong replacing them either. Good Luck
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