This is the first Beech bow I've made in over 15 years so no never tried heat-treating Beech.
The limbs are just over 1 1/4" wide.
I have a couple more staves of American Beech and one half log that, from the ripples on the back, may actually be Blue Beech. The rippled log is quite heavy and, after 20 years, must be well seasoned