Yellowing mid-plant?

I got the same thing happening to my Critical Gorilla Glue #4 Autoflower. I switched from synthetic to Organic, she's just hungry. I added a little more bloom nutrients and it slowed down. Don't think I gave her enough lol. I didn't realize how big these plants are supposed to get.

@ChitownCannaChica, Any thoughts on how often I should feed? Should I bump up to every other or remain at every third? Also, since the beginning of the week the plants have also gone from taking 3ish days to dry the soil to needing a feed every two days or every day. I'm feeding about a liter each time now, and with hardly any run-off. My 5g cloth bags are probably closer to being about 4g filled. Just switched to a different Trio schedule for autos to see if that might also bump things up a bit. Just fed, and my PPM is in the low 400's (with my water starting out at 215ish)

Tent Grow. Temp 82 during the day, and 79 at night. Currently watering ~.85l of water when dry to about 1.5". Using GH Trio at 1/4 strength every 3rd watering (feed/water/water). Adding 1/4tsp Cal/Mag every water. Water is well water pH to 6.5 reading in the 600EC/350ppm range. This is the only plant showing discoloration currently. Thinking its more likely I need to be more aggressive on the feed? Maybe every other instead of every 3rd or up the nutrients? Thoughts? No drooping or anything like that happening.