Yup. Great answers here. I'm sure it's a combination of shooting TTG as well as getting the post-processing. Personally, I like to see my blacks a bit blacker, so I would back off on the increase in shadows a bit. Also, most importantly, and as already mentioned, try to expose to the right (ETTR). The last thing you want to have to do when shooting at ISO 3200 is to increase the exposure even more in post. Shoot in manual and find an exposure that works for you. Just make sure, if anything, you ETTR; not the opposite. Personally, what I like to do since I shoot snowboarding (similar in the sense that most of the scene is white), is to turn on highlight alerts as well as check my histogram when initially setting up my exposure. I choose an aperture and SS and then increase the ISO until I start to blow out the highlights. The moment I see blown highlights, I review what part of the image is blown out and then decide whether or not I'm ok with that. Quite often I'll allow SOME parts of the image to be blown out but as soon as I see detail lost in my subject (or too much of the snow/ice), I back it off a bit and stick with that exposure. Hope that helps.
PS: When post-processing, if your exposure looks 'OK', try increasing whites rather then bumping up the overall exposure. See if that makes a difference. Also, when working in Adobe Camera Raw (ACR), I always press 'O' to turn on Highlight Clipping and 'U' to turn on Shadow clipping. Without this, I'd be lost