Soil Amendment information, Please?

The last two years I have had bad luck with my tomatoes, they die. I think I may have linked it to using different soil amendments that my nursery suggested. Last year I used a product called Bumper Crop. My tomatoes grew to a point, then died as soon and the weather got hot. This has NEVER happened to me. I have been reading that it is peat moss based, with bat guano, manures, worm castings, etc. Prior to that I have always used chicken manure, cottonseed meal, tilled it in about two months before planting and my garden did fine. Our yard has a lot of oak leaves and the soil tends to be acidic. I garden in raised beds, filled with a dirt that we got from a landscaping/hardscaping place. they told us the soil be be fine for a year and to be sure to add amendments the next year. What have you all found works good for your No. CA veggie gardens?

Can't answer your questions but maybe post in the Tomato forum
http://davesgarden.com/community/forums/f/tomatoes/all/

I also have raised beds. In Las Vegas we have to plant our tomatoes by end of March to assure that the roots are driven downward before the heat hits. I also mulch with a commercial compost end of April. I do add my own compost to the beds at the end of the season. I also spot compost in the raised beds wherever I have an open space.

Photo is champion from last season.