I tried everything, insectecidal soaps, cucumeris packs, and nematodes sacks. And they always brought them down but never completely wiped em out. Even sterilizing everything and consistently treating the plants every couple days.... What finally worked was putting the plants outside.
Kind of ridiculous actually that I spent probably about $200 over 4 months battling them, (this is only 2 plants in 5 gal pots) 3 weeks outside and they (Thrips) either moved on to more favorable plants or got destroyed from all the natural predatory insects (spiders, ladybugs, ants, beetles, wasps, bees, flies).
Anyways fucking Thrips!