I flush to kinda get the plant to finish, I have noticed if I don't and I keep feeding, the pistils keep coming and coming.  I really don't notice any smoke difference.  Maybe because I watched that High Times flush test with those cannabis experts or stoners not sure, but if memory serves me, they actually thought the non flushed weed tasted better.  But I definitely notice my buds finishing, if not my 2 weeks never ends.  And yea all i do is 2 tsp Clearex with a gallon of water for my 3 gallon fabrics for llike 2 weeks.