I noticed mine didn't do too well last summer (when the sun actually came out
once in a while), and that the plants growing on the north part of my garden
seemed to do a lot better. (partially shaded from the southern plants)
I don't know if it's the shade, or not watering properly (the south ones maybe
dried out and had moisture that was always changing?)

anyways, it seems that afternoon sun frys the toms a lot worse than the morning
sun.

just a thought,
let me know how they turn out.