It may be a little late to add much N. But you could since your flowering cycle is really just beginning..
They dont sound sick, and your shouldn't panic when seeing just a few yellow leafs. They may have stem damage and are not pulling and nutes. They will wilt off and fall away.
I have a plant with a odd yellow leaf in the middle. Im assuming wind damage and it may of took more beating from the fan then others..
hps, tends to yellow plants sometimes. Toss in few CLF. Dont need a lot them. Just may even out the light spectrum some..
its not a hot spot from your foil is it?. Foil may reflect hot spot from lamp, but I dont think thats the case..
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