My First Grow: Thought, suggestions...classification?

Hey guys, my first post on the boards, so I thought I would share what my first grow (outdoor/clones) is looking like. We are about 4 weeks in flowering, and I have been using "Beastie Blooms" as of late. Recently dropped down on the volume of nutes, (2tbs/gallon of H20, to 1 tbs every 4 days) as I am noticing some discoloration (yellow/brown) of bottom leaves...wasn't sure if it was burn, or natural. Which leads me to my next question: if you can spot the yellowing leaves, any hints as to what is causing them?
Lastly, I can not say that we are as refined as my friends out west in regards to our classification/strain maintenance. These clones were given to me as a gift from a friend. I have smoked from this particular strain before with great results. Very skunky, fruity smell and taste. High energy "head" high. As of now, these buds have a great skunk/orange smell.

Bump..anyone out there willing to share some knowledge with a newbie?

Orange skunk

Mods, if this is in the wrong place...please move it to where it belongs. Otherwise, bumping to get a little bit more feedback. Is there anyone out there?