if your canopy is devastated, do not flush. even if you have faith in flushing at end of harvest does something useful.
It has no impact on mineral content of developing flower and blind taste tests showed it is unlikely to impact flavor, either. a statstically insignificant amount actually favored the non-flushed, ironically, LOL, but a small amount that was well within normal expected volatility of sample size and probabilities involved.
you probably needed to give her more nitrogen, just guessing. lots of reasons leaves pale, but often a "bloom" formula neglects to give enough N. some people think you have to cease N in flower, which is insane to do. N is used in all sorts of cell components that need to be replicated for any cell to divide properly. it is needed at all times.