Ayhausca Purple (Spacebucket/Tub Build)

So this is a space tub grow, other than the above head light it has a 3500k led strip running around the sides(around 4 meters) is it worth keeping this lighting? I'm only running a 150 watt growstar led ufo, which is fine for my canopy but my bottom isn't nearly as dense.

Would a black strap molasses brewed tea help my buds add weight? I'm using only Fox Farm Trio and CalMag with reverse osmosis water, pH @6-6.5. While I have atleast 2 weeks left I'd like to get the most weight possible, if there is anything I can do this late in flower that is.

If anyone can see the third or fourth picture there is a decent shot of a deficiency. It's some immobile nutrient like Ca,Mg,Fe,Cu, ect. I just can't figure it out, been supplementing with CalMag fog almost 2 weeks? Any suggestions? Possibly Cu deficiency?