I really like your bows and this one is no exception!
Question: Sapwood seems softer than heartwood. Wouldn't that cause problems with FF strings??
Frank, I use 2x3 strand strings up to 70 pounds. At the ears are 2x2 pieces of dacron added. I wouldn't go without an overlay on soft woods like yew or juniper, but with osage I see no problem. I have made overlays from osage sap on osage bows, works without any issues.
BTW.: this is a heartwood only bow, the 'overlays' are heartwood rings
schöne Grüße!