Anyone have any insight as to where im going wrong...

Your flowering should end in few weeks , so just flush her to get rid of that dark green colors & all will be good !😀👊

You've had dark green leaves with burnt tips the whole flowering stage. Although the EC is not high, your new nutes probably have too much nitrogen for flowering plants, giving your plants nitrogen toxicity. For now, use plain water with no nutes, to really flush the excess nutes, else the smoke is gonna be real harsh.

Hey there, so my first thought was of a nutrient burn or of light burn, I see you have a strong hid and you mention this happened during the flowering stage so perhaps the change in light strength didnt agree with this plant and not the others. Magnesium deficiency can cause the margins of a leaf to yellow unlike a typical nutrient burn which usually attacks the tips not the innards of the leaf. But my moneys on light/heat stress. I have one plant who doesnt handle heat and light intensity as well as the others. The buds look great though, regardless of the problems, so great job where that's concerned.