When spraying your plant down with a very weak fert i always find that if you flush your plant first then a light spray right after you have fushed i find the plant drinks more and soaks up a lot more in the hour or so after you have flushed. Maybe this is a reaction from the plant, possable cause, the plant my have a sudden earg from the fresh water that you have jsut flushed it with too drink hard. I use a bubblerbucket growing system and i have found that the plant tends to drink more when flushing your plant than if you were to leave it just bubbling. Maybe this is a draw back simptom, the plant gets a bit of cold turkey for those few mins that you flush her out and must drink like crazy to get there hit. I wonder if the plants get high off the nuts. Sounds crazy Hmm?????