If it is alright, I am going to do Spring Mustachio's stats a bit differently. I will still downscale his regular stats to 8-C, but Nichirin explained in chapter 146 that 'the penetrating power of his attacks is so great he can't attack horizontally in populated areas" and that he is content to stay in low a-class because of this, implying that he is much more powerful. Given his performances with tomboy against Kombu Infinity, where he pierced cleanly through the Kombu and would have killed him, Garou, where he pierced through Garou's hand and might have otherwise killed him and Black Sperm, where he pierced cleanly through hordes of black sperm.
If there are no objections, Spring Mustachio will instead be "8-C, far higher with Tomboy"