I had a lot of trouble with thrips on Kaki persimmons in pots for a few years.
I gave up spraying chemicals when it seemed that wetting agent application seemed to control the larvae stage in the pots.
The larvae go down to the soil as part of the life cycle, the return to the foliage for he next stage.
Also a misting nozzle on a wand, that can get under the foliage and spray upwards is useful for chemical application.
The larvae are usually under the leaves.
Even high pressure low volume water mist sprayed under the foliage can knock a lot of larvae off, and interrupt the cycle.
Not sure if you have exactly the same thrips as here, but this worked for me.