I use teas throughout flower! Recently I started using growers choice recharge! It claims to be basically nothing but the microbs thats in the tea I make! So far I haven't seen a difference between the two so my guess is its dam close to my teas!
But to answer ur question you could put a Lil drizzle in with every water from veg to flower without any bad results! But a lot of times less is more! If you use teas then no need to add extra bc every tea has molasses! If not then I would do about a 2 second drip with every other watering!
But honestly we need more info about your grow to say any more! Everyone's different and there is a thousand ways to skin a cat! When it comes to growing there isn't really a step by step guide! There's a lot of variables like what have u already done, what your plants look like, type of growing medium, it all matters!
But as a blanket answer to your question about a 2 second drip of molasses for a 5g bucket of water about every 2 weeks, and start about the second week of flower! Atlas thats what I would do!