After all that, i decided to build a new wheel. I couldn't get the 800g of rotating mass out of my head. Here's the 'logic': When i'm climbing, lighter wheels are better. When i'm riding along rollers or flat or road, lighter wheels are better. When i'm descending, the fat wheel would be better. There is 14,500+ feet of climbing at shenandoah, and quite a lot of rollers. The down stuff is super fun - rocky and rooty - but realistically, most of my time will be spent otherwise.
So: Whub to duster with dt comps and brass nipples. Saves me a cool 300g on the front wheel. I hope i don't regret it.