Are you taking bets against it?
Not because it isn't well executed, but because the bending stiffness of that design is also finite.
Jonathan, a long time ago, on another thread, I asked you how stiff was your wire design. The question arose because at the time I had done my own tests and concluded the spider was the weak link in my scope. At the time it was harder for you to pinpoint the source of flexure but now it's obvious the UTA is the culprit. As you pointed out earlier, it may be difficult to say whether the shift is caused by flexure in the UTA structure or flexure in the wire spider (I bet it's both). But the test with the solid vane spider may help address this issue.
In any case, this is very interesting work and I'm looking forward to the following.
Sure, the stiffness of my solid vane spider is finite, but I’ll take bets that its at least as stiff as the test structure!