Oof, you're right. I'll have to remove that Assault Mode multiplier, then.
I've shown in the OP where they're accepted, so I'll just outline them here.
Basically
1st Demon Mark scales
well above a somewhat weakened Grey Hendrickson, who's
explicitly Red Demon Hendrickson + a Gray Demon added together. Additionally, he
greatly overwhelmed Snatch-amped Ban in speed and power, who
added all of Meliodas' speed and power to his own (Ban normally is
half as strong as Meliodas in the raws, but
faster than him).
Fyi, Galand was
markedly inferior, but
not vastly, to Ban after he stole
over half Galand's strength + some
fodder's power. So Snatch/Physical Hunt are additive in both feats and statements.
2nd Demon Mark Zeldris went from being weaker than Chandler and Cusack in his first mark, to surpassing an amped fusion of Chandler and Cusack (explicitly a being they were split in half from), and
outright doubled the speed of Ominous Nebula's vacuum by transforming.
So, it's from a combination of consistency, statements and
direct scaling that's already been accepted. I've seen similar scaling on lots of other profiles.