In addition to milling and bookmatching great numbers of natural curves, where we typically try to saw out the pith, as much an ascetic decision, as one of balance - I have on a number of occasions, helped mill multiple FOHC sticks from a single sawlog. The most notable occasion rendering six 6X8X48 pcs from a single log, all turning out as strait as one might expect of any ordered timber. Logs of such size are rare on the East Coast, in this case, we had the pick of any of the standing timber on a sizable acreage, a Scouting Camp, which had not been logged off in the sixty years it had belonged to the camp, and in all likelihood, for many decades before it was donated to the BSA.
I think it worth noting that the Center in FOHC is as important as the Free of Heart part, that to leave any unbalanced sapwood is a recipe for bow in most species.
Try to post some pictures when you finish milling your stems.