Rick, maybe you're also having some problems with internal BER as well.
When growing in containers, I always lime the soil/potting mix with dolomitic lime as a matter of course (before I see any problems). When preparing the planting mix, I use about a cup of slow release fertilizer and ~3/4 cup dolomitic lime for every 5 gallons of volume. When fruit sets, I generally add a handful of both the slow release fertilizer and the lime, thereafter I'll add more every couple of weeks or so, depending on container size and how often I need to water. More frequent waterings will mean you'll need to add more nutrients.
Mulching also helps to maintain a more even moisture level in those containers.
Excessive nitrogen can also contribute to BER, but if you're using kelp/fish emulsions (low nitrogen), that's probably not the problem.
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