Brown spots, high ph?

Little help for a newbie? I have an outdoor grow in a Northern latitude, somewhat sandy soil by a flowing creek. Plant seems basically healthy, but with some brown spots and browning/yellowing on some lower leaves. Soil PH is 7.2, what should i do to get it down? I've been feeding it organic fish fert diluted in water during veg, and have switched to organic bloom fert now that it is blooming. Have I overfertilized, or something else? The brown spots don't seem to be insect damage, I haven't seen any bugs.

Thanks so much!

looks very healthy bro but i dont think u over feed it i dont kno wat it is

they do look very healthy possibly pests? im not sure but they look very healthy aside from the affected area .