Love the tips! I’ve worked that way myself in a similar process, but morphologically, I just can’t match the road hip angle with a reasonable TT fit with my current constraints (bike and body, both). I have long arms, which doesn’t help a lot. I’m maybe only down 15-20w now, but saving WELL over that with a position.
I think another thing to note is that the hip angle measure from hip to shoulder is often not the effective hip angle. That turns out interesting to measure in some cases and is probably best done by feel if you’re experienced. I don’t know how to describe this as well as I want, but if you look at Dumoulin in particular, his hip angle is open because he’s very arched right above the hip, with the pelvis sort of rocked backwards. That’s effectively a more open hip angle, but there are definitely some morphology limits for some people to doing that as well as many top time trialists.
Ganna is another good example:
I think the significant arch/bend right at the top of the hip is one thing that allows power production when down so low.