With those pics you showed with what looks like eggs.... You better hit those plants before too far into flower or you may lose entire crop.... From what I have learned, during flower is when you want to try to limit your insecticide, foliar treatments to make sure you dont get rot or mildew in/on buds.
Here is how I am doing it and I am also new..... I have harvested only 10 plants or so thus far...... None seem to have been grade A quality, all seem to be a B- and all due to me reading too much from too many. After all my reading and questions have made me understand a lot..... one thing I have found out is different nutrients will show deficiencies differently, yet almost always it is a feeding PH issue when you follow the manufacturers feeding schedules.
I used General Organics for all my previous plants, it seemed to show more deficiencies than my current nutes (Nectar For The Gods). I fought with General Organics chasing deficiencies, when I did get it right it did well, but I wasnt thrilled by the product so I am now trying the Nectar line and as of yet '0' issues.....
I started out from seed in Fox Farms Ocean Forest, used straight well water at first no PH'ing till plant was about 3-4" tall and had a couple sets of leaves. When I did my first feeding I followed the feeding chart to the 'T' but at 25% of feed, then as they got bigger I ramped up the nutes till at flip then they got 100% full nutes PH'd to where the schedule said. I have noticed no issues so far, everything looks great.
I have also found lighting can mimic or exacerbate deficiencies, too much, too little etc, your plants need light to help drink up and utilize those nutes.
Now in my tent I have ac, a heater, a humidifier and dehumidifier....
It is much harder to fix an issue than to prevent.....
I have also found in many statements from around the web, some cal-mag works different with different nutrients, now this could also be a retailers stretch of truth saying you should use our version instead of theirs, but with my nutrients I do not use Cal-Mag, I use their products and so far so good, I would contact Remo and see what he/they recommend for Cal-Mag, he has a YouTube channel.
PS Google VPD