WolfgangS (& others if correction is needed),
I'm a newbie too, but my understanding is different than what you described. The Tested equity growth is just what that simulation produced. The actual equity growth in Trading can be very different. The DD and capital required that are presented are meant to be adequate with a high confidence level, but even they are not absolutely certain to be OK.
In short, use the capital Tested for your Margin & Risk settings (or the other way 'round
), but keep watching in case you're the one 2+ (or whatever) standard deviations out.
HTH (& is more or less correct
).