Now, I don't have any experience with avocadoes, so take this as you will. It may seem unintuitive, but have you tried watering less and cutting back the fertilizer? I know that a lot of fruit trees drop fruit and leaves when over-watered, and maybe if your soil is constantly wet (they are in quite small pots by the looks) it's potentially creating an environment for infection. Same with the fertilizer, maybe it's getting too much of something.
With the tying to a stake, I'm genuinely interested to find out, too. I had a capsicum that I'd propped up against a stake last summer, tied quite tight with ribbon, and it never really grew.#helpmarket is a great idea!
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Thanks for responding. Watering less was the first thing I tried back in July. The grower who sold me the trees had advised me to water daily, but I wondered if it was too much. Watering less didn't help, though. The Superthrive did help, and the leaves got much greener and bigger when I started using it. In fact, when the wilt started back in July, I wasn't using any fertilizer at all, so I don't think that was the problem.