Salt, you're way over thinking/worrying about growing in containers. Feed them like Mark said and let them grow.
No amount of over watering will stop them from dropping, it's the UV rays and unseasonably warm temps this time of year. It happens and the plants will adjust as they get used it. Try to keep the buckets cool if possible, the sun is hot enough to warp six packs I had outside laying on the ground. YEAH, it's that hot!!
We just broke 2 heat record days in a row. It's gonna be a hot year and the tomatoes will stop developing soon if this record heat keeps up. Night time lows are in the low 70's already and that's too hot for May.
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Rob
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