Why is this plant more yellow? Nitrogen deficiency...

Drop the pH bit more to 6 & see if that fixes the lockout.

N doesn't start at top, so you can eliminate that. multiple things can likely cause this, so rely on recent behaviour. so many things cause interveinal chlorosis and the tips are burned. if you feed consistently, i'd lean toward lockout, pH related cause... beacues you provide things, but the plant can't use them. if your feed doesn't include things like Zn, i'd leand toward that as the problem... you'll need to do some math with your labels, assuming they provide guaranteed analysis of chemical composition. otherwise, it's a blind stab in the dark and your guess is as good as a phD's.... as in.. "not so good, al."

Looks like it was begging for some nutes. Looks like your on the right path! Keep checking on her that bat guano can be some hot stuff. Happy growing!