It's far enough ahead to not need to calculate anything
Put it this way - Verethragna - assuming free AM3 - is the equivalent of a D63 Delay +51 H2H (D42 on WS)
Let's just toss the STR in there directly and call it a D70 H2H
So the reason free AM3 Vereth 99 is able to compete with Tlalpolani is that VSmite is good and Vereth has lower delay
Without AM3 Tlalpolani should be winning vs 99 - but I'l reserve my judgment to someone who cares enough to calculate it
So with Rigor Bagnakhs you're removing most of Vereth's Delay advantage and adding another +27 damage as well as (when maxed) +15 Attack + 10 additional accuracy and +10 strength (assuming I have those augments correct)
No contest
RIP Verethragna