Opie.... HI!
when using general hydropnics 3 part... the highest the PPM i would recommend is 1500...

and actualy, if it is your first time growing using this particular NUTRIENT solution then you should probably be very careful going over 1300..

If your PH is corrrect.. then your plants should be showing signs of hunger which can be eaisly fixed... as opposed to a PH imbalance which canoften leave parts of your plant necrotic.. DEAD

can you post a picture

: )