Also Soul Harvest is nice buff and with low CD it will empower practically every Bone Harvest hit after the first.
In my vitality Oppressor I even use it on left hand and you just acivate default attack if it’s on CD.
[1.1.5.2-1.1.6.2] Bone Appetit! Vitality CDR Bone Harvest Oppressor - massive damage, Crucible 170/SR 75/Ravager no consumables