Hey there!
As usual, some great advice form your fellow growers here on Grow Diaries.
I hav to 3rd the info on your pH levels, definitely get that down a bit as having the pH off will affect nutrient intake as well.
I agree with souljasam, it would be very useful to know the 'actual wattage' of your LED light, but just as both the other growers mentioned, 18-20 inches away is a good starting point.
Let us know if you need anything else! We will follow along=)