wait you either need to do one or the other, you can't keep flipping them back and forth. if you put them into flower, then leave them in flower. if you decide to re-veg, then re-veg until they are totally back into the veg state...but don't flip them again in a week if you don't see what ya want.
I don't know where you heard not to feed in flower, but it is wrong. You definately need to get a good bloom nute, lower in (N) and higher in (P), depending on the last time you fed them, I like to feed once a week...I can't remember if you were in hydro or not...if you are doing hydro, I'm not the guy to ask, if your in soil, then I would feed them a mild bloom nute, and increase it a little each week until you get the tips of your leaves slightly burned.