has any one used dutch pro

hi im at 5 weeks flower 4/5 to go. and have some yellowing they look hungry but there on max bloom nutes
would it be ok to add a little veg nutes to my bloom mix just for one feed to up the N. 2 of the plants are getting flushed in 2 weeks. the others will be flushed in 3/4 weeks

I probably wouldn't start mixing different stage nutes together, without knowing the outcome. Its totally normal for fan leaves to start yellowing during later stages of flower. If you are dead set on it, maybe try and get a hold of something organic like Fish Emulsion for some quick N, without the risk?