Auto Duck - Balcony Germany (Soil + Chicken Poop)

Yes, remove that weird branch. In my experience, any branches growing from there never amount to anything. Removal will not harm the plant in any way. Symmetry really does not matter, some plants grow with missing branches/nodes, or even extra branches/nodes. BTW, cotyledons are not leaves, the first true leaf is the first serrated leaf, usually single bladed, but at times, with three or two blades.

I think the manure was too much. Definitely too much nitrogen as the leaves are shiny and very green. You wouldn’t think a lower wattage light could be too much and it’s not really BUT it’s keeping the plant very short and node spacing too tight because it’s too content and not moving up for light. I’d transplant it to new pot (bigger) lay off nitrogen and move that light up some. Good luck

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.