Could be right on Shockwave being tied with QL for steepness, it's just kind of hard to judge because it somewhat shelves between sections of being very steep and others not so steep. Any trail that's steep enough to slide, is pretty steep. They had an "avalanche" on Shockwave a few years back. Actually, I think I recall Black Hole having a slide in recent years as well. Personally, I think Shockwave is the most difficult trail on the mountain due to the double-fall line as you mentioned.