Phosphorous deficiency or bacterial/fungal?

Need some help identifying what this could be on my tomato plants. It’s on my Marzanos, sungold, and Cherokee purple.

I have aphids and some powdery mildew and sprayed copper fungicide, insecticidal soap, and hydrogen peroxide solution on them (not all at once, but in sequence over the course of a week).

My sungold trusses have become brittle and if nudged the fruits fall off. This is what makes me think of nutrient deficiency. To rectify I watered with Tiger bloom and also side dressed some tomato tone.

What are we thinking? Thank you - this is my first year gardening