Your lighting will be flat, which is expected based upon your lighting setup. If you shoot RAW, your processing time and storage needs will increase dramatically. So be certain to know how this will impact your workflow and your future budget for asset storage. But you will have the highest resolution and the greatest processing capabilities when shooting RAW.

Your problem is that you're using Photoshop, which I know sounds counter intuitive. Instead of Photoshop, I strongly recommend that you get Lightroom. With PS you have to process each image one at a time which is a enormous time killer. With Lightroom, all you do is edit one image, copy the edits that you want and paste those edits into all of the other images. Lightroom gives you the option of choosing which edits you want to copy. So you can copy only color correction, or in your case, just brightness and contrast edits. Just as long as all of the other images were taken with the same equivalent exposure and under the same lighting conditions, you can adjust the brightness and contrast of a 1,000 images within 1 minute. Once done, you will need to export the editing images as JPEGs as LR uses non-destructive editing. This will take a good bit of time depending upon the number of shots and their file sizes.

LR provides a cataloging feature (similar to Adobe Bridge, but better IMHO) that will allow you to keep all of your images very well organized. You can assign star ratings or color flags to images which can make finding the images that you want much, much easier. The main thing that you can't do with Lightroom is cut elements out of the shot to paste them onto a white background. This is how Amazon.com does it as opposed to trying to get an ultra-white background in camera. You will need Photoshop if you need to cut and paste parts of an image or work with adjustment layers.

A good trick to getting perfect colors is to use the X-Rite Color Checker Passport. When I shot product photography, I used a simple gray card placed in the corner of the shot. Then I just used the eyedropper tool in PS to instantly get a neutral color. The X-Rite CCP is similar but far more accurate. If getting color is critical for your needs, which it probably is, then you will need to get a Color Checker. It allows you to produce a color profile for specific cameras, or camera/lens combos, all under various lighting conditions. Once you have a profile, it takes all but a few seconds to adjust an entire days worth of shots.