I cant see your grow journal to find out what wattage or light you're using but I'd start there. Keep in mind ak47 is a huge yielder but in my experience it was weight more than size. My buds were dense and heavy compared to larger fluffier strains.
I'm also seeing a slight copper coloured burn on the leaves which may be a phosphorus/magnesium deficiency, as opposed to yellowing which is normal nitrogen deficiency during flower.
Don't get too upset though, these issues are minor in your grow, and it looks like a good haul to be sure!
Next run be sure to stay at or below the recommended nute schedule.