I take my plants outside for 2 seconds here and they get thrips. Neem is not for flower, I didnt watch how you use it but it works very well. 1 liter of luke warm water, in goes the 8ml neem then 5ml babysoap (i use lavender jonsons baby) SHAKE and SPRAY. Once they hit flower i use ISO, I mix 900ml water with 100ml 99%ISO. The problem with ISO is it kills stuff it hits and then evaporates off so IMO once you have resorted to ISO you need to keep on the plants. With neem and ISO it needs to be applied every 3 days to stop the life cycle of the bugs.
I dont , I just do a epic ton of reading. Research is part of my actual job so I just apply that to growing now. Im scientific by nature. And also I have a thrips problem and I was looking into predator bugs too but I am also not sure I will use them. They do work though apparently.