Very small buds;( What should I do?:)

Has entrado al cuarto cuando estaba a oscuras? Esas plantas han sufrido un gran estrés y no han podido llegar a su etapa final como deberían, están muertas en vida.

Looks to be reveging and its not going to produce much so I'd scrap them and start again is all environment good fans filters and pH all ok I'd check the setup before starting again good luck growing

Personally, I would cut it down and start again. These buds will be hardly worth smoking. Also, only ever grow one plant per pot, otherwise they will compete with each other, with no one plant winning, but each of them losing out on maximum health. Secondly, by defoliating (so heavily, or even at all) you just reduce the plants ability to make energy, limiting growth/size/yields/health. All of the plants energy is made in/by the leaves. so........ less leaves = less energy being made = less growth. or............ Maximum amount of healthy green leaves = maximum amount of energy production = maximum growth/size/yield/health. The plant in question is suffering from very poor genetics and I would be inclined to use a different breeder in future. I can highly recommend Sweet Seeds, they have awesome strains with immensely stable genetics. After growing for 35+ years, they have become my "go to" breeder, so impressed am I with their products. Hope tis helps, Organoman.

There is not to much to do if the flowering is at the end of maturity (because the trychoms). The buds are probably already near to max size, but for further grows try to add CO2 or better lights

Sorry i didnt see that this was an auto, there was your main problem with the topping and the fiming you stressed the shit out of it. Auto's DO NOT like stress at all. if you want to do all the topping and fiming and lst hst use a photoperiod plant.

maybe its revegging? I would just ride it out at this point

based on your grow diary, not enough nutes and your ph in soil has been off the entire time slowing down the plants growth. Also, don't mix lines unless you really know what you are doing. IMO your nute regime is incomplete. Sorry I hate to be the bearer of bad news. with advanced and gh you really have to follow their expert schedules, which means the entire line. It can get expensive. but IMO thats prob what happened here.

Is this an auto?? They do that sometimes. Just luck of the draw. Nothing you can do atm, let it grow out or ship it and start a new. If its a photoperiod, get it under more light and then it back into veg. No idea of your grow lights, just guessing from the photos, but they may need to be stronger. Good Luck!