u shouldnt feed in the last week man, or else its not technically flushing at all ! or if u dont feel they are done just leave them for a further week ? use a magnifiying glass and check the trichomes for amber/clearness - i think u shud b aiming for about a 50:50 mix of amber to clear trichs, but thats just down to how u like ur high anyway. u could even wait for 80% amber trichs and u might pack a bit more wieght on ur buds in the meantime :/ gd luck (im gonna wait for 70-80% amber trichomes on mine)