don't worry, as long as all u fed them was the molasses then ur good. Mollasses is used when flushing because of it's high amount of potassium (supposed to add flavor as well, but idk about that), as flushing clenses the soil of pretty much EVERYTHING. Adding the molasses gives the plant at least SOMETHING in the end, and if anything will make the bud taste better, not worse, like normal nutes. Personally, I'd suggest using molasses throught flowering, adding it to normal nutes, then when ur done with the nutes, keep givin em the molasses with the water. Hard to overdo it really, but use 1tbsp per gal. of water every time u water. Be sure ur using UNSUPHERED MOLASSES! as it is the purest form which is best for ur plants.