Week 5 yellowing, N def or natural fade?

Running a photoperiod strain, currently at day 35 of flower. Lower and mid-canopy leaves are yellowing pretty uniformly, starting from the tips and working inward. pH is dialed at 6.1, runoff matches. I'm mixing my own base at roughly 150ppm N, 50ppm P, 200ppm K at this stage, which is where I usually land mid-flower. Here's what i'm trying to figure out: at week 5, is widespread yellowing more likely a genuine nitrogen deficiency or just the plant naturally pulling from fan leaves as it pushes the final bulk? The pattern looks pretty classic senescence to me, not the patchy or interveinal stuff i'd associate with a lockout. But I've also seen people push N harder through week 6 and swear by it. Do you guys bump N back up when you see this, or just let it ride and trust the fade? I don't want to chase a ghost deficiency and end up with harsh smoke from excess N at the end. Curious what the more experienced flower growers here do when this shows up at the 5 week mark.

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Seedling1d ago

I would switch your N and P. N 50ppm and P 150ppm Reduce N during Flowering as the plant doesn't need much of it at this stage. For Flowering (photo) I use 3-14-15