5% acidity vinegar 4 to 6 tablespoons per gallon of water will make them jump out of their containers with growth if all else is correct.
This should happen in about a day or two maybe three to show results not months.
I personally dont think 7 is anywhere close to the right PH for tomatoes.
It is on the upper limit of where it should be around 6 which is 10 times more acidic than 7.
What you might have to worry about is too many locked up nutrients being released all of a sudden.
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