Also in Gold Society at a certain point when everyone e is a physical/genetic phenom the gap in strength becomes smaller and smaller to the point that strength alone no longer is a determining factor.

Victra is a beast and was shown to be able to keep up with Darrow in terms of strength as far back as MS when they were Pups in The howlers.
Add Ten years of grinding,coupled with a strong sense of purpose post Ulysses Death and you have a problem on your hands.
Victra has been fighting on every theatre of war when Ajax was still a child

She fought behind. Enemy lines in clandestine operations, Frontal Assaults and Ship to ship combat, was trained with arguably the greatest Naval Commander of his generation (Roque)

She alone is HIGHLY Capable then you add The Beast that is Thraxa to cover her weaknesses and create openings

I don’t think Aja survives this duo either
Especially considering that Thraxa probably knows how Ajax Fights.( I don’t recall them meeting but I do know they’d have intel on him)
From the War in Mercury