Cannot rotate / raised beds

[mari.beth]

I only have two 4x8 raised beds in which to grow my tomatoes. This past growing season, my plants had blight due to excessive rain (East TN). I saved most of my plants enough to get through the season using the bleach solution recommended by B54Red. I really want to grow heirloom tomatoes in the same beds this year because I do not have anywhere else to grow them. I plan to add compost to my soil, but was wondering what else I could do to the soil to help prevent disease (as much as possible). I would like to stay organic (that was the plan last year, but I resorted to bleach because I was desperate!) Any ideas would be appreciated!