Wow! That's fantastic. What a great report.
20-40 F is a good working temperature range for Zero
That covers about 90% of the skiing I do. The Pacific Northwest is famous for slushy snow. Having skis that not only do well in these conditions, but are geared towards it, would be very nice indeed. Of course, then I would have to get two pairs of all of my skis. :)
The Fischer S-Bound skis are actually a line of Fischer skis that range from fairly skinny to decent sidecut (although pretty wimpy by today's standards). Some of these have metal edges, while some do not. I'm not surprised that the Silent Spider is a popular ski. I believe it replaces the Inbound Crown, which is a great compromise ski. It is light (no metal edges) but has decent sidecut (10 mm difference) with enough flotation to make your own tracks. It is a great ski for logging roads or backcountry touring if the snow is good and the terrain isn't too steep.
I would love to hear more about ultralight skiing. This is an inevitable compromise, of course. The lightest gear is the skinniest, and is meant for groomed tracks (by racers at that). It can be used in the backcountry, but only if the snow is really good and the terrain is really mellow or the skier is really, really skilled. On the other hand, I would love to hear reviews of skis that carve well despite their really low weight. With a really lightweight ski, you can pair it with lightweight boots, so that the overall weight is really low. Being light on my feet is one of the main reasons I switched from alpine skiing a long time ago.