Thanks for a quick response. I answered your questions right below.

Your lights are too high. Or is that the distance from the bulb to the lower leaves? I go with 18/6 in veg.
~3ft from the bulb to the very top of the plant.

Mediums are not all the same. What kind of soil(s) are you using? Regardless, it's a bad idea to mix mediums. Same goes with nutrients. Pick a brand and stick with it if possible. Some are buffered differently, some are heavy on organics or nutrients, some aren't...
Soil: Scotts and Miracle Grow
Nutriets: K-Gro All purpose Plant Food

Why do you have to boil the water?
Because there is chlorine in the water and other impurities. When boiling it I sterilize the water as well as burning off the chlorine. I also let the water stand 24hrs to make sure the chlorine is completely gone.

Anyway...the leaf you copy-n-pasted looks like it's the victim of water damage. When watering, I often have to wend my way through branches and leaves, and if I leave the nutrient solution on the leaves, that's what happens. Plus, the washed-out look is likely from a lack of (useful) light, plus, the plant is scavenging nutrients for delivery to the rest of the plant.
I attached another photo of the entire plant. I make sure all water just gets on the soil. I never let the water sprinkle on leaves.

If I am not mistaken the light being used is a 400W high pressure sodium. And the entire room including the floor is painted white.

And yes, a tid bit paranoid, haha saw the disclaimer thing on another post. Thanks for the help so far!