this looks like the beginnings of a calcium deff to me (the first pic with rust spots), the yellowing seems to be two issues; necrosis (in soil, this is perfectly normal. as your plants flower, they will "eat" the stored nitrogen in the leaves, which makes them turn yellow and die off.
the other thing i THINK i see is mag def. many times cal and mag can go hand in hand, but realy depends on your water; most tap water is very hard, and has ample calcium in it. if you are like me and are running well water, there is a chance that your water is soft, and is causing a lack of ca.
to fix ca and mag, you can purchase a product called cal/mag, and use it every feeding, 1 tsp per gallon, or, you can use epsom salts for the mag def (on tbs per gallon) and blackstrap molasses for the ca def. imo, the nitrogen def is nothing to worry about. the leaves will continue to yellow and fall, and you'll be left wit mostly bud come harvest time.
i'm sure bg will be here, he sees much better than me (i STILL can't find my friggin glasses...) and if i'm wrong, he will correct me.
kp