I would say a flat belly and be very careful and slow with the tiller to keep all the limb
working.I would try 1 1/2 at the fads tapering to the tips, and at least 66 n-n That seem to work good for me on most white woods that are questionable in comp.
I would also do a little
mini bow test on the wood before I started,nothing fancy,just a sliver and do a little bend test,some people say Lighting struck is good medicine but I have had bad things happen with lightening struck trees ,especially if it was hit hard,kind of dries the wood out from the jolt.
Just my suggestion. Might save you some time and sorrow.
Pappy