You've not tried using it and dropping the IK 4 set? I cleared a 46 earlier using 6/2 and Bul Kathos weapons, was an absolutely terrible rift with low mob density and full of yellows, was running 45's with the same setup in under 10mins a time. Using Convention of Elements combined with a physical build and Heart Slaughter like you have would be very strong.
Depending on the quality of your old weapon it might be better than the 4 set. Maybe if you're going higher you need the 100% uptime for survival, but having a strong base damage and then having Berserker up on top of that during the Convention ring buff (so you use WOTB just as the ring is hitting physical) will give you monstrous burst damage.