i know ya asked Eric, but here is my unsolicited opinion... :D
ipe can be a bit narrower, and "feels slimmer and lighter" never weighed them compared to my osage.
i sure love yew- mainly cos i have lots of it here, and for a backed bow it is great.
i wouldnt say that it is sensitive to temps, but more so to MC. just like all woods have a perfect mc, so does yew- it likes around 12% so ive been taught, osage around 8%, hickory around 6%.
just seal them all well. yew is a little softer, so you cant throw it down the mountain ahead of ya, but it sure is a very pretty wood, with lots of "swirls and islands".- but my other two choices are ipe and osage- they are all on a par!