Dabkinganswered grow question 7 months ago It is very common for Autoflowers to go into flowering on day 28 (4th week). Some even flower on week 3. Genetics and pot/container size are the two biggest factors.
Your plants do seem to have a lot of Nitrogen, however looks mean nothing. Unless you get it tested, you, myself, or anyone else will not know for certain. Regardless, your plant is flowering so you should cut back on Nitrogen and bump up the P and K (Phosphorus and Potassium).
Here is what you can do to increase the yield: Absolutely nothing. I can however save you from lowering your yield. DO NOT defoliate any branches or buds.
Also, May I recommend Youtube and searching either Harley Smith or Dr. Bruce Bugbee.
There's a BUNCH of "bro-science" out there. Experiment around...sure. But at least try and get on the train tracks facing the right direction.