Michael Nagel posted a reply:
AFAIK, the exposure meter in Canon's DSLRs is colorblind. This may lead to inaccurate exposures if there's a strong color imbalance. Since there's mostly blue in your shot, it's no wonder that it is overexposed, because it's seen as much darker by the exposure meter.
Color balancing will only get you so far if there aren't any colors to balance. If there is only blue in your shot and you shift towards orange, you'll mostly make it darker and introduce more noise, but not achieve significant color changes. Balancing works by giving different weights to the three color channels, but that doesn't work if only one of them carries significant information. Example: a pixel with RGB (red, green, blue) values of 5/10/100 that is shifted towards orange may end up as 6/11/80 (+10%/+10%/-20%), which is still mostly blue.
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