Seems to be getting some steam now.
I applied Monterey Spinosad and so far no new thrip damage and no live visible at this point.
The seedlings didn't seem to mind.
I expect I will transplant into 1 gallon pots of Build a Soil 3.0 recipe next week.
@Refus6510, Great decision. Buildasoil is top notch. Couple with microbes of your choice occasionally and boom. I like either rootwise or Impello Biosciences for microbes. Now I'm playing with saponins and silica, but I'm not knowledgeable about those yet.