What are you growing in and what strain is it? Your npk is a 2.7/1/2.5 is that right cuz you have it down as nkp .
If its blue dream I was told that it likes nitrogen maybe you didnt feed it enough nitrogen in veg and it looks n and p deficient to me.
I wouldnt flush now if you do hit it back with full strength nutes since your in flower, if you were in veg then I would say hit them with lighter nutes. Up your P a bit.
