The purple looks genetic, and gorgeous
Just my two cents...
Yellowing of the lower leaves says you're out of N. Burnt leaf tips say you've overdone it just a bit with your bloom booster. Also, if you need P, that you surely need more K as well.... K gets used up faster in flower than P, and also is used for a longer duration of the flowering. P supplementation is needed during heavy flower setting... which you're just about through. Being that your soil is used up, and you're likely deficient across the board, I'd feed lightly with a base bloom formula. If continuing to supplement w/ a booster as well, use one with both P and K. P = energy. K = quality.
I know you already mentioned it... but your deformed foliage growth really looks like revegging from a light leak, or some electronics in the room emitting light hitting that area?
Overall a great looking grow, congrats