I have a 68" reflexed r/d ipe/boo longbow which is nearly a 50/50 combination. Badger shot it through the chrono a few weeks ago and probably remembers it
.. Very few pieces of any wood can easily handle this ratio, much less draw 60+ and be under an inch wide..
Which is why its my favorite.. when I finish getting it purtied up. I'll post a pic..
I've also had good success with hickory, elm, yew, osage, walnut,oak etc..I just cant get away with the same limb extremes..Like Bob said I think guava would be a good candidate for this as well..
Rich-no substitute for density