Big fan of Maichan’s Daily Life, what got me into Guro in the first place! Classic Uziga Waita if you’re a fan of his works!

I’ve not heard of Superjail, I’ll give it a look, thanks for the rec!

For another manga that explicitly features gore/guro there is Tokyo Red Hood (bonus immortal loli protagonist) and several more from things like Berserk to Violence Jack (spin-off from the Devilman Series if memory serves).