I use 1020 flats for germination and start in either 72 or 18 cell inserts. I plant heavily for older seed and 1 seed per cell for newer rare seed. Everything tomato gets started in April after peppers are planted. I have 3 flats germinated, 2 more planted and 8 or 9 more to plant. Up potting I reserve for very rapid growers. Most I let get root bound in their cells and plant them past the lowest set of leaves when they go into the ground. I also pot them up if I'm giving plants away. But I have enough tomatoes started that I'm not worried if they're a little stressed. They are misted often, get good air circulation and are under adequate lighting. Up potting might get tomatoes on some varieties a week or two earlier. But once they get planted out most do fine if they avoid something eating them. So up potting isn't a priority for me.
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