When the plant starts to set fruit, I would swap your current blue stuff for 4-18-38. For in-ground plants, I have alternated the 4-18-38 and the calcium nitrate, then gave them magnesium when they began to show deficiencies.
As for amounts, I never was the type of person to measure anything. I think a good rule of thumb is to start at about half the strength that the manufacturer suggests, and play around from there.
If you re-pot the plants at all, it's a lot easier to just use Osmocote, then you don't have to fertigate as you water.
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