I found one leaf that has some serious problems (D...

Hi @CloserB! Plant was overfed in the past, I can tell by looking at the burnt tips. Your room is a little bit overcrowded and your plants were not pruned enough, some parts cannot get enough light, and as you probably know, light helps in absorbing the nutrients. As a result, the lower leaves of the plant are slowly dying and the lower buds will remain small. However, I wouldn't worry too much at this stage, as mentioned by others, you're really close to the finish line, she should naturally start to fade and yellowing will spread everywhere, that's a normal thing and it will help in finding the harvest window. Hope this helps, keep us up-to-date and happy growing! 👊