Flower stage advice needed

I can see tip curling of your big leaves, but it does not appear to be the "Claw", or N toxicity. But I do believe it is due to either overfeeding, or underfeeding. What changes, if any, had you made to your nutes when this started to happen?...PH is also good I'm assuming?

When cannabis is being fed heavy flower nutes, it generally needs a supplement of calmag...the yellowing between the veins makes me think it could be that, along with the leaf tips drooping, I'm betting that if you back off of the flower nutes you may not even need to supplement with calmag, but this is all based off of those two pics...I'll need more info in general before I'd say anything other than an overferting/underferting issue.

Typically the older leaves will show mag def first with the newer growth being normal but if in doubt try a foiler feed with Epsom salts which has a pretty quick response time.