"2.5L liters RO water every day since it’s been in flower , soil PH fluctuates between 7.0 and 7.5"
^ these are the obvious issues that jumped out
And is this a camera angle or is there white powdery stuff on some of your leaves?
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I'd like to see more pictures of this, I'm not sure what this is yet, what's your humidity like?
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In your opinion does it look like this picture?
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Edit: re-read and see your humidity is 55 - 65 rh, & it's too high
Summary: If not an odd camera angle then I suspect the top issue may be white powdery mildew, and the black spots are leaf septoria
Search these two terms on the internet and compared the picture, and if you think that's what it is there are some steps you can take that might be able to help, good luck!