Pics dont show too much. I believe some canoeing is normal with diff strains to a point. But by the way you are feeding her and what you describe it sounds to me more like you have the begginings of Nitrogen Toxicity. Are these brown spots on the top fan leaves starting with the ones that have the most direct sunlight? I think that is way too much Nitrigen to feed even week one at flowering. Need nutes around 5-5-5 or so first couple weeks flowering and than less Nitrogen and more Potassium and Phosphorous like 2-7-7 and weeks prior to flushing cutting down Nitrogen as much as possible without like 0-5-5.
If she has too much Nitrogen than you need to change your res with some Superthrive and an 0-5-5 or so nute mix. If Nitrogen Toxicity, than there is nothing you can do but wait it out for a week or so feeding her ZERO Nitrogen. Looks like she is outside. If so I would Foliar Feed with a 0-5-5 at dusk and dawn, more at dawn and alot less at dusk.
Chances are you may get some other nute lockouts from the toxicity, so go with 1/2 strength only.
I think if it is outside, you can use small amounts of molasses which will contain some trace elements. Make sure you are using PH balanced water. If it gets real hot outside than I would shade her from the sun's intensity as this will accelerate the nitrogen burning off and causing the brown spots until you have this resolved.
I have had this 4 times worse than yours and trust me solve it now if indeed it is Nitrogen Toxicity. The pics kinda suck you have so hard to tell.
Are you East/West/North/South?
