While molasses has some calcium in it, I don't believe that it is enough to even be considered an amendment. Most people use molasses as a food source for the microbes, not a source of calcium. Unless the plants are showing calcium toxicity, I would continue like you are.
As you are doing the organic thing (Yah for you!) you should think about brewing up some teas for nutrients. It is so much better for your plants than things like Earth Juice, which are usually heavily chelated.