@Countryboyjvd1971 I filled out the questions as best I could in my reply above and posted a couple pictures of the plants. I also took a closer look and noticed some more small holes on leaves of the two plants that aren’t showing any of the speckling/discoloration. Here are pictures of those:
I still can’t see any bugs on or under the leaves, though. When one of plants got some bigger holes in them earlier in the grow, which I suspected were from slugs, I sprinkled some Sluggo around the base of the affected plant and also sprayed some Dr. Earth Final Stop Snail and Slug killer spray around the base of the all the plants a couple hours after each watering for a while. I sprinkled some Spinosad dust on the affected leaves too and didn’t notice any more holes for a while.
I’m still not sure what exactly is causing these holes though, so I’d appreciate any insight you have. What, if anything, should I be doing at this point to keep it from getting worse? I’m reluctant to get any insecticides, even “natural/organic” ones around the buds, as I really don’t want to be ingesting that stuff.