Just seen this on some on the lower but newer growth, I have been having a few issues with this plant drooping on and off, seemed like it was getting better then I noticed this 

That’s a valid point, to be fair they was all growing at different rates. One plate the same size as another and get it drinks a third less. I kept thinking somethings up hereI'd just feed that plant half strength base nutes pH'd at 6.0 for awhile. Once a day is probably sufficient.
Since you growing auto's you must have started those plants from seed. Not every plant from seed is going to be the same. You'll get genetic variation from seed to seed. That particular plant doesn't have a liking to the amount of nutrients you're feeding it which is why it's looking unhappy. That's one of the top reasons many people like to run clones. They're pretty much all going to grow the same.
That’s a valid point, to be fair they was all growing at different rates. One plate the same size as another and get it drinks a third less. I kept thinking somethings up hereI'd just feed that plant half strength base nutes pH'd at 6.0 for awhile. Once a day is probably sufficient.
Since you growing auto's you must have started those plants from seed. Not every plant from seed is going to be the same. You'll get genetic variation from seed to seed. That particular plant doesn't have a liking to the amount of nutrients you're feeding it which is why it's looking unhappy. That's one of the top reasons many people like to run clones. They're pretty much all going to grow the same.