Help with plant that I don't understand.....

So this happened to 3 other plants of mine, 2 before flower and one 2 weeks into flower!

The leaves droop and turn brown and this doesn't stop until it is completely like below (this is a different plant)



This is the plant on July 22:




Then on July 25 (just before Sulfur Spray, details below):




Then on 7/25 I spray "BONIDE PRODUCTS INC 142 Sulfur Plant Fungicide Organically Controls Rust, Leaf Spot and Powdery Mildew" ...... mix = 4 Tbs into 1.3 gallon sprayer, because I after much research determined that this was "Rust Fungi"

The following pictures are of the plant a few days after Foliar Spray on July 31 (sorry about the spots, they are due to my amateur spraying abilities and since then I have learned to shake off the plants and not leaves droplets behind):



It seems like it is coming back, please note that in the second picture about, ALL the plants that have experienced this have never come back to this level!



And now you can see Bud Sites are developing:





One last thing to add:
After spraying I kept reading and looking around and also came to a conclusion that it is possible that the plant could be rootbound and thus I transplanted it from a 10 gallon to a 15 gallon about 3 days later on 7/28 from spray day.

This is the bottom of the plant in a 10 gallon smart pot just before I transplanted it:



Soil = Fox Farm Ocean Forest
Days into flower = 22
Nutrients = Fox Farm
Avg Temps = 77-85 degrees