Girl Grow Northern Lights Auto

All 3 plants are adapting very well to LST, the shape its growing into have been allowing the light to reach further into the lower growth nodes and branches. I like to start bending the branches close to the main stem as early as week 3 of VEG. Now these 3 Northern Lights Auto seeds are from Sun West Genetics, they were all germinated, planted, trained, fed the same way they have been on the same controlled environment since day 1, the 3 are totally different, I know each plant is unique in its own way, but I find strange that 1 plant is taller and stronger than the other 2, the smaller one is growing weak leaves with signs of mutation, all 3 plants show signs of Magnesium deficiency, these 3 plants are sharing a grow tent with a Haze Auto from Seedsman, all 4 plants are under the same diet, the Haze have no signs of deficiencies or mutations, I guess that shows what good genetics look like. For the Magnesium deficiency I have mixed my own Epson salts into water and applied as a foliar spray, internet said the spray should be used every other week, wait 2 weeks to see results. Signs of Nutes burn, I decided to stop feeding for this coming week. The 3 NL leaves are looking unhappy, kind of clawing under, they look lifeless, I have ruled off a few potential problems such as: Wind Burn Under Watering Water PH Light Burn, just moved the QB higher to 17 inches from the highest canopy today. If any of you fellow growers have advice for the leaves, please let me know. Stay Lit folks 👩‍🌾🏻