Miles, you mentioned putting down epsom salt... this is my recipe for setting out tomato plants.
I got this from someone here on the fire, a few years ago.
Dig a hole about 1' deep- throw in 1 handful of each (fertilizer, epsom salt, cottonseed meal, and lime)- fill hole 1/2 full and stir up the contents- finish filling hole and put plant in the top half. This will let the roots find the nutrients as it develops and not burn the small plant.
Dont forget to water the small plants.
