With regards the delicate tomato, may I suggest keeping them in the pot for an extra week before transplanting?
I usually give my tomatoes 3 weeks in cell pack before potting up, and at 3 weeks those cells are full of roots and the transplants never show one sign of stress... it's all gratitude at that point. This year I decided to pot up at 2 weeks - the cells were not full of roots, some soil fell off in the process, and plants looked stressed for the first time ever I've seen on potting up. I submit that getting slightly potbound is a benefit when it comes to transplant. Even if you tear or spread the roots, they don't seem to mind it at all, compared to moving when their roots are less firm and abundant.
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