Thatís funny, my S2 goes towards the red a little.
Here is what I have found works very well!!!!!!
Once you are ready to shoot either with gods light or your own, set a custom white balance, then just before you start shooting for real, have you model hold a gray card towards the camera and in the light you will be using.
Once you get to your Photoshop open the image with the gray card. Create an adjustment layer and then select hue/saturation. Take the mid tone dropper and click on your gray card. you can move around the gray card a few times but each time you click you will see the image cast go away to what should be about as close to the real colours as you will ever get.
hope this helps.