So is the shed not the grow room anymore and the plants inside?? Or they still in the shed?
Sounds like you got it under control with the sprays. I hate those white powdery bugs, they can get bad where I live.
Lemme just say this: much earlier in my sativa grow, I noticed a couple of gnats flying around in the grow room and grow box. Then I got a gnat infestation, which I did catch real quick and knocked it out with Gnatrol and yellow sticky pads. So you know that 2 bugs ain't never just 2 bugs.