Again not trying to start an arguement, but I don't flush either. I've tried it and have not noticed any difference. One big key is I do my best to not over feed my plants in the first place. My buds always have good taste and burn very smooth to a nice white ash. One big reason I don't flush is I run a perpetual grow so I have plants in my trays of different ages all the time. I will usually flush at some point in the grow to clean things out, but don't bother at the end. Once thing I do and it seems to help is to stop watering them the last few days to encourage the plants to use up all the stored resources it has. It then begins a slow drying process(7-10 days usually) before I trim and cure the buds.
I would agree it looks like 2 more weeks.