Your problem is what you have in the containers already. Adding more junk to it will only make it worse.

Read here about BER and what causes it - and it isn't lack of calcium in the soil.

Then do some reading on what growing mixes belong in containers. They don't include garden soil or pea stone or compost or bone meal.

Container size is yet another problem.

Sorry but based on the information you have provided and this late in the season it is going to be really difficult to get any usable tomatoes out of your set-up no matter what you do now. Better luck next year.

Dave

Here is a link that might be useful: BER FAQ and discussions