Sorry brother just saw this today. Your question must have gotten pushed back especially if there was a lot of people asking questions. Who ever told you it was a potassium issue guessed wrong. If it was potassium the edges of the blades would be browning and the leaves would start to curl and become brittle by now. Looks more like a zinc deficiency issue possibly a boron deficiency or both. Pretty unusual. Its typically due to having a ph above 6.5. Another possibility is an excess of phosphorus can cause this type of lockout also. Your in a state of "nutrient lock" this is why your buds aren't bulking up. I would give her a light flush with 2-2.5 gallons of ph correct water in the 5.9-6.3 range. Add nutes back into the last quart or half gallon. Check the ph of the runoff the first time you run water through her this will give you a better idea if the ph of the soil is higher or lower than what your putting in. Also if you have a TDS meter see what the ppm is of the runoff. It wouldn't surprise me if it was pretty high. Let her dry out a bit more than usual after your flush. Hope this will get her back on track you still have enough time for those buds to fill in. I'll follow your grow. Good luck.
ThatoneAKguy 
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Could it be nitrogen toxicity from too much fertilizer I just run into a problem like this and they were turning yellow from the inside out and dying I perform a flush my PPM were 4000 + even though pH was at 6 do you have some fan leaves stems looking purple do you have the leaves with the claw are the leaves easy to pull feel weak if the answer is yes you also must have some deep green shiny and your Leafs this is nitrogen toxicity and what it does it makes your plant not grow and also makes you not produce good buds in fact you might see you buds foxtailing you seem pretty and vans in flowering nevertheless to get bigger fatter but you need to bring your nitrogen on check test your PPM out of your run off and should be a thousand or below if not flush it until you get those numbers pH is very important but your problem is not caused by pH is probably too much nutrients. Put some clear pictures of the bottom of the Leafs and the top part of the plant where the leaves are changing in color look at my journal to see if you are suffering something similar to mine
@DinafemSeeds, Hi Mark! Today is watering day and I suspect you might be correct and I’ll be taking a runoff ph test again and the devil will be in the details for sure with straight water.
@ThatoneAKguy, considering the issues you've had you have still managed to create some lovely looking flowers with amazing colours :ok_hand:
I do think the issue was to much feed as your run-off is still at 700ppm which is around 1.4ec. You need to get this down more but as your on the flush now this will not be needed :+1:
I do think you that the harvest is more closer to 14-20 day's away and not 5-7 day's :facepunch:
Are you checking trichomes colour and development mate?
All the best:v:
Mark..
@Canadian,the runoff is 650-700. I’ve done feed,feed, water and it dries out between waterings. Usually a little more than a half gallon until it runs off. The buds are swelling quite a bit this week actually and she’ll be done in 6-10 days as some of the trichs are starting to haze up this morning.
Thanks for your comment!
I’m just going to flush her now.