Hi Growmie, looks like thrips to me.
Normally, neem oil would be the right remedy, but since the flowering has already progressed, I would avoid that.
Always use yellow and blue sticky traps in your grows to detect an infestation early.
I completely showered my plants during an infestation and used neem oil. After that, it was mostly quiet. Just so you know, black spots on the leaves are thrips poop.