Elktracker,
I use quartersawn wood, and the Northern Michigan woods I cut are nearly allways "slow grown" (tight-ringed) makes great bows....got elm, both oaks, maple, ash, and others with really tight rings (1/32" and there-abouts).......but that's just me, a lot of the other fellas dont think much of the idea....but it works for me.
With oak, ya do want to check for grain sworles....they can show up as "figure" in a quartersawn board and thats why they used it for furniture.....in that case ya will want a backer. Otherwise, it should be about tough as nails. The oak would/could also serve well cut into backing strips (straight grained) for other woods.
rich