Growth has really begun to take off! I've been making tweaks to my setup. Got nervous I was getting some light through the bucket so I covered it in aluminum foil to block out the light for a few days while I was getting a lid painted and ready.
Painted with two coats black to block any light and then 3 coats of white for reflectivity of light and heat. I have been reading various methods and was torn on whether to top it since it is an autoflower or just let it go. Pulled the trigger and went forward with topping. The growth has been good and she's looking super happy!
Any issues related to pH and nutrient deficiencies seem to have resolved themselves.