G13 Labs Pineapple Express - Hydro DWC w/ continuous drip all Advanced Nutrients

Hey Crew it's been a couple years since I have been on these forms. I have started a new grow using exclusively Advanced Nutrients in my homemade DWC system. Here is a little history of the grow so far. Currently in the first 3 days of flowering after a long 8 week veg time from seed using a dimmable 400w MH and LST/SCROG'in the plants something nice. The last week of veg I upgraded to a dimmable 1000w HPS on the Apollo Purple Reign Series Ballast which can be used with a 400w, 600w or 1000w bulb. I am using a Hydro Farm AC cooled reflector with a MaxFan Pro 420 CFM on high keeping the room at a nice 80 F. The strain as I said is Pineapple Express by G13 Labs. Early on about week 6.5 i had started adding Sensizym purely for cost saving and neglected to check the EC/PPM each day and due to the enzymes decaying the root zone for fuel the PPM spiked to over 2,000 in just 8 hours from 1300. After coming home and see the plant tops drooping, I immediately pulled 3/4 the water out of the res and replaced with PH adjusted water, saving the plants. They are doing well, but the two on the right seem to be struggling to bounce back from this as the others did on the left. Additionally, there is something in my solution that is causing the PH to lower a few 10ths every day or so, which I have been easily correcting with water(btw my water is bottled from the store). I have yet to flush through the entire veg process and have been reading some things from other posts about flushing every 3 weeks to reduce salt build up, is this recommended? As for the plants not bouncing back, I don't mean they didn't at all, but they are just now starting to show healthy signs and with this PH lowering issue, may be causing a bit of a deficiency since my PH is sitting at 5.2 and dropping every few days. I also had a question had trimming leaves as to not cause an issue but still keeping optimum light penetration. Is there a tip anyone has? As of now I am pruning from optimum light penetration not keeping growth in mind, most of what I am cutting are fan leaves. Thanks in advance for any assistance. Best Regards, OD

Current Nutes:

All Advanced Nutrients

Micro-Grow-Bloom three part
B-52
Sensizym
Rhino Skin
CarboLoad Liquid
Piranha
Tarantula
Voodo Juice
Bud Candy
Bud Ignitor
Sensi Cal-Mag(Just added 9/29/15 to correct deficiencies)
Bud Factor X

Supplemental CO2 via MyCO2 mushroom bags.

Any suggestions or things you may notice please let me know. I will post the same pics again at 1am once the lights have turn off.

Best,
OD