Plant Drooping 3 Weeks into Flowering!

Hey everyone I just started Week 4 of flowering and I am currently growing 6 female Northern Lights X Master Kush in an aerospring setup. The flowering has been going nicely so far but since I changed my reservoir last thursday my plants have had a bit of stunted growth and one of them is very droopy today even though it looked fine last night. My ph is at 5.8 and my TDS is around 1350 ppm. Here is my nutrient mix:

Liquid Earth Bloom and Vigor (4 tsp bloom and 2 tsp vigor per gallon)
Awesome blossoms (2 ml/gal)
Sugar Daddy (2 tsp/gal)
Superthrive (1/4 tsp/gal)
Flavorful (1 tsp/gal)
SM-90 (2 ml/gal)

I have included a couple of pictures so that you can see what I'm working with. It's hard for me to tell if there is a problem with the roots since the Flavorful gives them a nice brownish tinge, but they look about the same and I'm using the sm90 so it shouldnt be a problem. This is my first grow so if anyone can help me out that would be awesome.

You are the only one that knows the problem. Its some thing you did different. When i see droopy plants i think over watering.

look at your roots...soil or hydro ?

It's hydro. I've been playing close attention to my roots but it's deceiving because the flavorful gives the roots a slightly brownish tinge. When I looked at them yesterday they did look a little bit slimier than usual, so I completely dumped my reservoir and am now just running a solution of hydroguard and sm90 in phd water. I hope this helps because a few of my plants are looking pretty droopy now. The last time I changed the reservoir the only thing I changed was adding my bloom nutrients at full strength instead of 3/4 strength. After I put up my first post I changed the nutrients back to 3/4 strength and the plants still only got worse. The really fucking weird thing though is that one of my plants looks unaffected and is still beautiful yet its roots don't look any better than the others. I'm truly lost, the first couple of weeks flowering went perfectly with buds developing everywhere, now one of my plants looks like it's all but dead. Please help me guys and don't tell me I know what it is cuz if I did I wouldn't be posting on here thanks.

You added a full dose of nutes. Some plants can take more nutes then others.