What kind of damage do you do normally with that (protless mobs)? I only get around 15k crits with an s5 savage wand, meteor/asuna, combo card, sung bfo, r1 applicable passives.
I haven't tested in months but last time I did fully buffed (cater/inspiring bfo/bone chip, etc) I could hit 40ks+ on raccoons without combo card but it would be a little bit higher now cause I have better max damage enchants and the combo card so it'd probably be closer to 45ks or so. You can't really rely on something like inspiring bfo and temporary boosts like bone chip for actual runs though.
People who specialize in magic also would not normally get such high numbers via BFO since their STR and max damage enchants are usually lesser than those of people who specialize in physical combat skillsets and might be better off with vivace + vivace speed reforges.