A lot of yellow leaves, do you feed them enough with N, even the few first weeks of flowering?

When i follow feeding schedule from the brands, they usually told you to switch for flowering feeding as soon as you see flower/pistils.

That's a mistake, i had better results keeping the growing N fertilizer for about 2 weeks after the first flowers appeared. Progressively lower it mix with PK for another 2 weeks.

Because they stretching a lot, especially yours are haze they tend to stretch even more and suck up all the N nutrients, if they doesn't have enough in soil they take it from the leaves, they turn yellow and later doesn't properly absorb energy from the sun. so you may ending with small/weak buds