your ph needs adjusting and your giving too many nutrients as well. Check out this page for more help on identification of these sorts of issues https://www.budsgrowguide.com/cannabis-nutrient-deficiencies-excesses/
Looks like you still have some time to go, they will fatten up like THT said. For your next grow you might want to start looking into doing some plant training. That will greatly improve your yields. Check out budsgrowguide.com they have some great info on training up there. You can also check...
Pull your light up 3 or 4 inches and see if that helps, if not raise it another 3 or 4 inches. You are so close to harvest you should be ok no matter what happens so don't worry too much
Are you seeing any of the tips of your leaves starting to burn? If not it isn't the light. Your heat is a bit warm and your humidity is pretty high. Likely your plant is just moving all its growth power to the buds and the rest of the plant starts to not do as well.
Good deal, you'll really enjoy seeing the trichomes up close, its a real site. I use a Zorb to view my plants and am able to take close up pictures with that microscope. I love pictures of glistening trichomes.
Agreed get a loupe at least 60X or more. The plant looks done from the photos but that isn't a 100% call without seeing the trichomes up close and personal. If the Trichomes are nice and foggy or turning amber you are good to go. Remember to flush your plant any time now to clean out the nutrients.
that's odd about the seeds coming cracked. I buy my seeds from two sources and have never had one seed not take. Check out this article both are listed at the bottom. I've actually never used a seed bank, is that just another name for retail seed sellers?