Lowering N is not a good idea. It will yellow your plants and cause slow growth, so don't do that. There are other things you can do to minimize stretch like topping, super cropping, and LST'ing. All of these training methods can also help fill in the grow space and add to overall harvest weight if done properly. Another great option is to use a MH light instead of HPS or get 6500k lights if you're not using HIDs. Some even go for MH the first two weeks of flower to minimize stretch and then switch to HPS to bulk them up.
This is not fully accurate, there are things to be said about ol Earth Juice. I do like Earth Juice, but it is in no way bullet proof or a beginners fertilizer. Earth Juice Grow/Bloom are NOT complete by themselves. They do need to be supplemented with micros, they even sell microblast. The bottle says to not use RO water because they are expecting to get the extra micros from your tap water. Lastly, Earth Juice has some PH issues that need to be addressed. It is acidic and needs lots of PH up, but if you bubble it, it will stabilize a bit so you wont need as much PH up.
Here is a link for those that want to learn more about Earth Juice
https://www.rollitup.org/t/the-true-earth-juice-tutorial-2011.448580/
