I've heard of the vacuum problem and experienced it in other cars but this isn't it. The ice mode is very easy to reproduce on the stock braking system and it doesn't require full throttle and zero vacuum to get there.
Easiest method to reproduce it is to heat the brakes up with several 60-10 braking attempts, then let the brakes sit and heat soak for about 5-10 minutes. Attempt some more 60-10 on a slightly less than perfect surface, small bumps, few grains of loose sand, downhill incline, or anything else that can take grip away from the rear (in particular) and it will raise it's ugly head. It doesn't seem to happen as often with the AP Racing brakes for whatever reason (less rear bias perhaps). Stiffer suspension also seems to help ward it off. Smoother application of the brake pedal also helps prevent it by preventing BA (Brake Assist) from intervening. BA responds to any sudden pedal application and amplifies the braking force typically resulting in a full ABS application. Setting the car up so that you don't really need ABS also helps. Definitely an evil computer at work here.
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