You are so far into bloom i think it doesn't matter.
If accompanied by blue-green leaves, it could be a P-def. LEaves don't look like this... the purple i see is more likely senescence / autumn related colors.
leaves look a big glossy, maybe? I'd wager some minor lockout. Whatever it is, a minor adjustmant would clear it up i think. if you calculate ppms from guaranteed analysis labels, you can make a more informed guess.