Help With Stelth Hydro Nutes.

So I am new but here is my story. I am growing six lowryder 2s in the bubbleponics system with distelled water with a ph of always 6.25. I am using the nutes that they provided I used 1/4 of the Grow (10-5-14) one week after germ then added another 1/4 a week and a half later. I then saw signs of overfeeding (Lower leaves having rust spots and leaves curling down) I then changed the disteled water and nutes to a 1/4 bag of Bloom nutes (5-15-14). it has been a day and no change and no water drop(well maybe a little). How long should I wait to do something else. Someone once told me it might be a N prob.
 
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