Flushing can be great i go by flushing if you have a problem, but what would flushing solve in this case is all im getting at? what are you trying to flush out? just saying like that his problem seems to be pointing at lack of food, a flush would futher leech his soil from anything thats left in there in the hope to flush out what? the change the ph to what? i really dont know why he would flush in this scenario is all im saying, flushing is good can really help if its needed, but either way it shocks the plant and then to do it when its not needed would just further hurt it/ starve it