I have long use soluble fertilizers in a 3:1:2 ratio for almost all my container plantings. Fertilizer RATIOS are different than their NPK %s. The ratio is much more important because the actual dosage is controlled by how much fertilizer you mix into the fertigation solution. 24-8-16, 12-4-8, and 9-3-6 are all examples of 3:1:2 RATIOS. I've settled on Foliage-Pro 9-3-6 as my 'go to' fertilizer for almost everything.

The link I left below should give a broader overview of the approach many of us take for container culture. If you have questions, you can ask here or there.

AL

Here is a link that might be useful: More about fertilizing containerized plants

I know what caused the low results on the tomatos. You need CAL+MAG. You uses fish ferts alaska? Did you use bloom and veg or just veg? that could be another prob. you need the 0-10-10 that the fish fert has in it to fruit. you need the cal for your tomatos they need a ton!Also add 20% perlite or more to your soil for pots.

Adding Ca beyond an adequate supply isn't going to help your plants take up additional Ca. Usually, problems associated with BER are physiological, rather than chemical.

Al