Discolor during flower-help

I’m about 3 weeks into flower and having yellowish leaves towards the top with dark spots. See pictures. And starting to get worse.
Here’s the specs
- in soil using 747 solid and farm farm dirty dozen nutrients line
- lights (2) sf4000 spider farmer
- I PH check all nuts and water between 6.3-6.6
-temp range between 66-69 at night 72-78 day
-using CO2
-recently started a been oil spray for insects. But this started before I started spray.
-lights are about 18-20 away.
 

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