HELP! New grower, yellow with browning on older growth spreading up the plant

[GoGrowGo]

Hello,

I am brand new to growing and I am having some trouble with my plants. I finished 4 autoflowers a few weeks ago and lets just say they did not turn out well. (I will make another thread with questions about what went wrong with them). I thought my main problem was PH which I corrected with these 2 photo plants I have now, down to around 6.0-6.5. One is OG Kush and the other is Northern Lights. Both are showing yellow older growth and it is spreading up the plant. This started early on and has only spread up the plant over the last few weeks. OG Kush was planted on May 1st and the Nothern Lights was planted on May 15th. I grow in 3 gallon pots with organic soil mixed with peat moss around 80:20. I grow outdoors in a greenhouse at night and out in the yard during the day. Temperatures swing from around 70F at night to 100F during the day. I use fox farm nutrients and CalMag. I have tried increasing the nutrients a small amount but I am worried to go more bc I had burning and nutrient lock out with my autos when I did it with them. I have attached pictures. Any suggestions would be greatly appreciated.

[Rwise]

Pic 2 the very top that leaf has WPM, which means you have moisture on the leaf and warm temps, need more air flow.
The yellowing is most likely normal for the temps you have (and the WPM), I am running 99-110 for highs. I tend to pluck off anything with WPM.
Peat has a PH of ~3.5, god IF you need to reduce PH, can cause PH issues.
PH in veg you may want to hold it 6.2-6.5 then 6.5-6.8 in flower.
I find it harder to grow in small pots, I use 135 gallon raised beds. When the heat is on burn there is more moisture for them to work with, the small pots can run out in this heat.
Next.