Regarding speed wobbles....
I've ridden my FL1 roughly 5600km this year and routinely do Cat1 and HC climbs near me. What goes up, must come down...so I've done a lot of descending at 70+ kph.
I've experienced speed wobbles exactly once which I attribute to a confluence of events unrelated to the frame itself: I was fairly cold descending, there was a particularly strong crosswind in exposed sections of the descent, and my wheels were somewhat deep with bladed carbon spokes.