Pulling Green Screen.

Hello all.
Recently I was given a job to extract people from green screen shots. There are forty different photos, thus I'm trying to stream line this process. I'm not having much luck though. I've used the color range option, but the hair is the real problem because it leaves a greenish halo in the different strands.
I've also done a trick by switching to LAB color mode, duplicating the "a channel" & adjusting the levels until you achieve an extreme contrast & creating a mask that way. It's worked the best, but it still takes some time & there is still some green present.
My brother uses After Effects quite a bit because he's in video production. He too uses green screen, but it's so simple to pull in After Effects vs. Photoshop. Does anyone know of any other tricks or tips to really pull the green behind someone. Unfortunately, the green screen doesn't appear to be too evenly lit, so there are different shades of green throughout. The real problem is the hair. Any suggestions would be GREATLY appreciated.
Thanks!

Understand also that TRUE chromakey is an integrated hardware/software system, and has some strict set up and calibration requirements in order to produce the best results.
With what you want to do, you can succeed in ditching 99.99999% of the background, and get nice smooth edges, but then you have to worry about objects taking on and reflecting the color of the backdrop they're shot against.
That's where it can get tricky.
I wish I could offer a one-size-fits-all solution, but there isn't one. Good studio shots with expert lighting techniques go a long way toward mitigating the problem in the first place. It's a real art, and not many folks are able to manage it well.

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