Nute Issues (Seems like all the time!)

First indoor grow so I'm learning as I fuck up =)

Switched over to 12-12 light cycle about 5 days ago, and with that change I switched up my nutes to a recommendation I got from this forum... Running at about 750ppm right now, PH is a constant 5.8...

I have a 50/50 split with these leaves and how they are coming out... Some are super skinny, dark green, and curl down... while the others are a perfect green color, perfect width, and shiny... I decided to not fuck with the nute solution since it was a 50 50 split and was just thinking the plant was adjusting to the new nute solution.

Reason I'm posting now is I noticed the bottom stipules (I believe thats the name), are starting to turn a yellow shade and one of them just straight up shriveled away... Is this normal when switching to flower? Do I need to adjust my nute solution? I'm using General Hydroponics Flora series and it's roughly a 5-5-10 mix (gro,micro,bloom)... The pistils are still in tip top shape, just not the stipules.

Any ideas?

Full Plant, grew 3.5 inches in the past 5 days since switching to 12-12 light cycle

Not the easiest thing to see but look at the stipules...
Skinny Shiny Leaves
Normal perfect leaves

don't worry too much about it, they look fine to me.

WTF are stipules for anyways?

Ok, starting to have more and more leaves come in that are super skinny, really shiny and dark green, and curled down... Here is a good pic of one... I'm running at about 750 PPM with general hydroponics flora series... the formula im using is 5-5-10... so 5ml of gro, 5ml of micro, and 10 ml of bloom for every gallon of water in my res... currently there is 5 gallons of water in it...

Is this problem due to something the plant is lacking? to where I could just add more micro or something along those lines? Or is it getting too MUCH of something...

OR, should I just not worry about this... Been in flower for 10 days.