1st attempt stealth closet grow

Hi all. This is my 1st attempt at a grow, something I’ve wanted to try out for years. I knew I would make numerous mistakes which is why I chose northern Lights in a 2.5 x 2 x 5.11 gorilla tent with platinum p300 led and a 4” rhino carbon filter and 4” rhino fan which died after 3 months so replaced with another make. No intake other than just using 2 fans for air movement she has just started her 9th week today but I think she looks very sad! Suffered from nute lock out in veg and then again mid flower where I flushed with plantlife burn fix. It made a difference in veg but now I am not sure! leaves haves always been super green but I think she looks very skinny and I am not sure if she is just set back a few weeks from any stress or something else? My local hydro shop gave me pk 9-18 last week so I have used twice at half recommended doses as I believe it is very strong and I’ve been using half strength old timers bloom since the flush. It looks to me as though the colas are being suffocated by the leaves and wondering should I trim them back to allow light or will this remove the food supply? I have done it to 1 colas but don’t know if I should just leave her to fill out on her own or has she suffered so much I should learn from my mistakes and move on to the next grow ? And suggestions would be appreciated Regards Turbo0040