Bud washing. In case you dont have pests you dont need to use
hydrogen peroxide or baking soda with lemon, but it helps remove other stuff like dust, nicotine and other smoke related stuff (if you have an indoor inside the house and youre a smoker), dead bugs (specially if you had a really bad gnat infection, they tend to stick to the buds and die), would also help with the silicon, etc... If you wanna go straight to the point of "how to" its marked at minute 5:23
Also you might cause mold and rotting by spraying it during late flower, the buds accumulate a lot of humidity. Another thing is that you shouldnt spray them when the lights are on and you should dry them asap or just do it right before the lights go off. I have the feeling that part of your problem is caused by the spraying.
As for the nitrogen toxicity, it looks similar, shiny green leaves, but I expect to see more clawing if its that advanced, theyre shiny most likely because of the silicon, but its worth tackling every possible problem and maybe even if its not the main problem it does have a bit of excess nitrogen, I see a bit of clawing just not enough to justify the plant being in such state.
EDIT: Forgot to mention, if you are indeed spraying them, dont be shy with the washing, move them slow but for a long time, inhaling silica dust can leave you with a permanent disease called silicosis which scars your lungs (silica dust are very very tiny crystals, harmless to the skin but not to the lungs) and inflamates them.