A closer picture will help, try getting a close up of the worst affected leaf.
Looking at the top red box, I don't see the "clawing" associated with "over Nitrification"
The lowest leaf in the bottom red box seem to have a bit of a curl, often lower leaves can show over Nitrification,this is due to them not receiving as much light as the top of the plant due to shading , which means they can't so readily photosynthesize and leaves them with higher levels of Nitrogen.
There doesn't seem to be a problem judging by the photograph you supplied, as I said a closer shot may show something I missed.
I'm guessing you have already stopped feeding veg nutes an started bloom nutes judging by the state of you young buds.
By feeding bloom nutes the Nitrogen levels will have already been reduced.
Thanks for rotating the pic Mikey, I thought this grow might have been in Australia, lol