Flowering, you want your girl to be nitrogen deficiant so I would use plain water for one feeding after switching to 12/12 then switch to a bloom nute like any bloom booster such as ff "open sesame" til week 6 then switch to ff "beastie bloom" till end of bloom. Or for cheap nutes I have also seen people have decent results from going to walmart and get like african violet nutes or something low/to no nitrogen and high in phosphorus (second number).
You do not want your plant to be nitrogen defficient... You do not want your plant to be anything defficient. You cut down on N during flowering and start adding more P&K, does that mean you want your plant to be P&K defficient during Veg??