This year, I have been very impressed with a hybrid tomato variety named Fourth Of July. I planted four of them in early March and had ripe tomatoes in less than 60 days. They produced abundantly until septoria took most of the leaves off and then the heat killed most of the branches back. After about two weeks, the plants started producing new growth from low on the dead stems and branches. i cut them back until none of the plants were more than ten inches tall.
All four plants are in identical beds with the same amount of moisture, nutrients, and sunlight. Two of the plants have already grown above the tops of their cages again and are loaded with new fruit in 106 degree weather. Two of the plants are only 1/2 way to the top of their cages with only a few fruit and a few new blooms.
This evening, when it cools a little; I will dig the under performing plants up, prepare the holes with organics, minerals, and other nutrients and replant them. I'm curious if it is possible to "reboot" a tomato plant when it isn't performing well. If it doesn't work, I will replace them with some "grown from cuttings" plants I have under lights.