Need some advice, couple plants not doing so good.

G plant 1 Chernobyl plant 2 Gauva Kush.
Started from clones, grown in Happy Frog, been watering every 5 days average. Used technaflora grow a few times during veg 1/2 recommended dosage every 3 watering.switched to technaflora bloom when I switched to flowering 12/12. Grow was 6-4-3 Bloom is 2-6-6. They are now 5 weeks into flowering. Under 1000watt hps, mh bulb for veg. Temps are around 78 average 30-40% humidity during light, lowest to 62-72 35-42% humidity during lights off. Already found out through this site I lollypopped to high, thinned a little too much. This my first real grow. Been ph ing distilled water, I'am on a well with a softener. I think that's everything.
The Chernobyl just started yellowing overnight
The Gauva Kush leaves have become clawed and the veins are dark
Both got feed 5 days ago, which was last watering. Last feed was 3ml per gallon, mixed up 2 gallons for all 4 plants. Last feed before that was 3 waterings ago and I mixed up 2ml per gallon, 2 gallons split 4 plants. Other two plants are doing good. Blue city diesel and Sour Kush. Although the sour Kush leaf veins are a little dark too.

Here's a pic of all 4 plants, granted not the best picture due to the hps light.

Just wondering. Are you waiting for the soil to be dry before you water?

Those droopy leaves look like they are overwatered.

But be warned. I'm a beginner. More interested in the answers of more experienced growers.

Trying to let first 3 inches dry out, been putting waterings at about 5 days sometimes 6 days apart.