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Soil mix was nearly exactly the same, except there was no composted manure
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What was your source for this?
New growth coming out curly sounds to me like the effects of herbicide.
Even composted cow manure can be a source for this if the cows grazed on land sprayed with 2-4D to keep down weed growth in pasture.
I have never encountered plants with "too much nitrogen", so I can't really speak to the impact of that.
However, I do agree with your assessment that the nitrogen in tomato tone would be a much slower release (and harder to over supply) to cause this effect.
This is why I would lean towards the herbicide in the steer manure as the root cause.
Can you replant a couple of the worst looking plants in alternate pots without the steer manure? After a week or two, you should notice a difference in the new growth.
Best of luck!
Lee