What is the optimal container size to avoid transplant shock?

For the record I'll be planning in my 1.2 acre food forest in the spring. Since I live here in Florida I am going to start plants from seeds / small cuttings that consist of pigeon peas, lentils, everglades tomatoes, moringa, chaya, hibiscus, sunflowers.

All in all about 300 plants in this selection.

Previously I started a lot of seed in 16 oz solo cup set of for drainage. When the plants got larger enough to transplant either into larger pots or into a raised bed garden…….I had…