from the pics you last posted , it looked like you just fed them a little too much. no biggie.. But with that being said i feed my flowering plants at 1100-1300ppm from week 2-7 , When you figure out your regime you can def jack up the nutrients. I always use a (base) A and B ) & add additives from there.
http://yellowbottles.gostorego.com/flower-a-b-1-liter.html . Here is the base i use. This shit is super pricey but i like it. Its quality shit for reals !! Also i will give you a very good tip that will help strengthen you plants steam.
http://www.everydayhydro.com/aosb1lc.html <---- for strengthening steams.
The Seaweed on this next thread is very good as well !
http://grow-biotic.com/id70.html <---- this whole line up is the shit !! its all organic,cheap and very strong !! when im done using the "yellow bottles" line up i am switching to Grow biotic for sure . I am going to use this line up and add a few bloom boosters to bulk shit up !!!! i highly recommend this Grow Biotic line up !!