Hello! Started indoor growing not too long ago, and had some questions.

Starting with my setup:

Genetics: Barney's Farm Wedding Cake x BF Super Auto #1

Tent: 4x4x6.5

Lights: Two Spider Farmer SF-2000 (at %80 about 24 inches away from tops, 18 inches or so on tallest bud)

Ventilation: 225cfm carbon filter system, 200mm Muffin fan pointed at LED ballast, Two 120mm high cfm fans above the LED fixtures... when things get too hot(pics at bottom of thread), Tower oscillating fan, Another house fan pushing air into the tent because the tent only had one air intake at the bottom... Treating it almost like a computer case, But not too much air movement I don't want the plants to be whipped around.

Climate Control: Basic Walmart humidifier, The room the tent is in keeps at 65.F pretty much all year.. so the drivers for the LEDs and the fans do all the work, Heat mats for the hard wood floors/winter time, all on Temperature and humidity sensors, Pro CO2 x Bucket

Nutrients: FoxFarm Dirty Dozen with Cal/Mag (1/2 of recommended at first then went full strength according to their scheduled)

Environment: 18 on/6 off, 45-50% Humidity, Daytime Temp 80.F, Night Temp 70-75.F

Other: 5 gallon fabric pots with 14 inch plates underneath, Basic pest/fly stickies

So now all four of my plants are the same genetics and I've been treating them pretty much all the same ( LST/feeding/watering ) Why is it that two of them look super bushy, tight, and green (ones on right in above picture) while the other two have stretched out and have a nicer color? They have been cycled around the tent and treated almost the same.. The lights are even linked together.. Silly enough the plant I beat up the most is growing the best, as I almost broke the main stock in half and stopped training that part of the plant. You will see the taller plant in the pictures....
^Seems sad.. The spots are from me hitting the leaves with water the day before photo (dried up nutrients). Super packed together, leaves look kinda sad, and super green...
^ This one I broke the stock really bad.. but it looks happy and the color is nice...^ Other one seems happy too..
^ This one also looking packed together, leaves are less droopy but still very green..

Does this just happen or have these plants gone through something i don't understand yet? Should I flush? Did i stress them too much when training? Not enough light? Too much light? Man growing outside is way easier! LOL

I'm not too worried just want some info from the outside, and any help and tips will be greatly appreciated!! :D

Thank You Out There!