T2i/550D LCD Screen Too Bright

So I've been playing tug-o-war with this issue. The images I shoot, whether photos or video, look fantastic on my T2i's LCD screen, yet when I move either of those types of files to my computer, they look SO much darker. I've installed a color profile designed by Technicolor in order to get a better range on my shadows, contrast, and saturation in an attempt to correct this, yet they all look COMPLETELY different in terms of exposure than they do on the camera's LCD. The brightness level of the screen is set to the middle setting (4, I believe), and going much darker will darken the controls on the screen, so I have a hard time believing that it's a screen brightness setting. The shadows, the noise, and the overall contrast is EXACTLY what I'm aiming for when I see it on the LCD, but the moment I open up images (RAW or not), the shadows are totally crushed. I don't see the contrast characteristics whatsoever on the computer screen that are VERY evident on the LCD, and it's getting on my last nerve.

Anyone have any insight or advice?

I use the high-resolution LCD for a focus check and the histogram; I don't use it for an approximation of exposure. As you have found, it's misleading. The histogram is a much better tool for determining the distribution of tones. Take a picture with the meter centered. Switch to live view with the histogram visible and set your exposure to push the brightest tones as far right as possible. Compare the two and I think you'll find the second shot more in line with your expectations when viewed on your computer.