I can't tell sex for certain, but the flowers just look female to me, just based on that photo. It's more a gut feeling, or just my own experience, there's no clear indicators that I can see.
I don't know Coco, so can't personally speak for your nutrients.
Flowering is a major hormonal change and can swing plant needs dramatically. Demand for certain nutrients will rise, this is about the time you start seeing issues with going rootbound, salt buildup, etc.
I'm not trying to worry you. Don't worry, there's no need, it just a matter of knowing what to expect. An experienced Coco grower should be able to help with that. I only know soil.
Molasses is only good for feeding bacteria, so if you aren't managing a micro herd (heh, or rven if you do...) you can pretty safely exclude that one.