Came back for the new update; equipping GF and RoSS didn't increase my damage much as I'd hoped

Howdy fellow barbs,

Running the regular immortal Selig barb and the only mythics I had before the recent update was Selig and Ramaladni's. Since then, I've equipped grandfather and replaced one of the rings, heavy hitter, with RoSS. My damage was in the low trillions, about 2-3T and with the gear changes only went up to about 6-9T.

Overall, my gear isn't too bad; stats are where they should be for the build for HP, fury, fury regen, with CHC at 90%, Crit Hit is almost 11k, vulnerable damage is a little on the low side at 400% iirc, and CDR is 50%, but otherwise close to current build guides online. Still can't figure out why I'm not hitting in the double digit trillions like others are with the same build and similar setup.

For anyone who went through something similar what change(s) did you make to see your damage dramatically increase into the 30-60T range?