How to help buds develop? Or is it late already?

Basically too late to do anything now that will change the results noticeably.

I wouldn't give the plant anymore PK13-14, with what you said the trichomes are looking like I would actually start a 7 day flush and once the pot is dry go ahead harvest ....

The optimal strategy before harvest is too cut all PK boosters 2 weeks before harvesting… You flush only when you have given too many nutrients during the plant life cycle. For bigger buds it’s too late for adding PK. This was during week 4,5,6 of bloom. My advice is to give it only water from now on and let the plant break down all its nutrients, particularly the Nitrogen…

what you do helps a plant meet its potential, but you can never force a plant beyond its potential by overfeeding. There is no magic supplement that will turn average sized buds into donkey dicks. Push boundaries of feeding as best you can, but be realistic if you see toxicities forming... don't continue to burn the shit out of a canopy just because the peanut gallery says to boost P/K in flower. there are upper limits to feeding. Dial back when you see toxicities. Keep track of how much you feed and how frequently etc etc... these things take weeks and sometimes months before a symptom caused by feeding presents itself. Worse problems show up quickly. Genetics is primary factor for how well a plant yields. You cannot polish a turd, otherwise. (not saying you plant is a turd - just a generalization to emphasize the point) 35-40 DLI && well-fed == as big of a harvest that plant can provide given ambient co2 and avoiding extreme VPD ranges. tighter environmental control, supplementing CO2 will require higher DLI and will result in better yields. Genetics is the limit on potential.

Its week 5 of flowering with 300w led

overwatering, vegetative overfeeding and super HST - broken main steam This from your diary Autoflower dont like all this they will not give the best of them at the end. For me continue as it is more pk can harm her more than help

You're in 3rd week flowering with TS2000 ? It will get bigger for sure , wait for it , I see you use Canna nutrients too , I would advise to start giving some PK13/14 if you have it

I woukd say by looking you are ready now or a few days from from now. Later if you want mote couch lock effect.

Color proportion from above is correct only for top tip of central buds, overall there is not amber at all - milky and clear are 50-50