First grow ever: micro Hindu Kush Auto

This have been a very struggling week... I've been encountering a lot of difficulties and due to a technical problem, was unable to connect to my account to post in the grow questions... I started the week with a flush. After some research, I saw that the thin fingered pale top leaves and the beginning of a Cal-Mag deficiency I was observing were most probably a result of too much PK. It has been confirmed by some burnt tips on the leaves, so I flushed the soil right away. Unfortunately, this resulted in a cascade of deficiency I had a lot of trouble identifying... Leaves were falling down at a concerning rate, some with what looked like Nitrogen deficiency, other with burnt aspect... Meanwhile, buds were not fattening, or really really slowly... I gave nutes in a light dilution again to the plant and she seems to be getting better. Buds seems to be fattening a bit more now. But I guess this week has stunt the plant a bit. She's not producing much trichomes untill now... If I had to guess where I did wrong, I think I overestimated the development of my plant: Even if the biggest colas stopped stretching more than a week ago, some lower colas stretched quite a bit this week. I guess she was still needing more of a vegetative mix than what I gave her last week... Too few nitrogen and too much PK must have done some damages... Even if this is my first grow and I obviously need to learn a lot, this has been a really stressing week full of culpability. I'm glad she seems to do better now though.