I think the consensus advice is to move to a higher phosphorous and higher potassium fertilizer. Phosphorous has a reputation as the bloom nutrient, but I think potassium may be even more important.
After fruit start to set, I use a "tomato fertilizer pack" from Morgan County Seeds. It's one bag of 4-18-38 and another bag of calcium nitrate, used alternatively. I have just started noticing that I have a small deficiency of either magnesium or iron, so I just bought some Blue Planet Nutrients Calmag. It's calcium, magnesium, and iron. It's expensive, and there is a picture of a tomato on the label, so I have high hopes. I am going to work that into the rotation, so it will be three parts instead of two.
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