Can confirm, when in collision with a foe the ‘slap’ hit collision is broken. Its even worse when crouching, you slap through the upper waist of opponents and not even make contact.
Headshots on Maulers, Dreg, Scab can’t be done with ‘slap’ and when crouched you need to aim below their waist line to score a hit.
Compare this to the club wide arcing swings, it has a really wide collision box and one can aim far above an opponents head and still score a hit.
Expected behavior, to have the slab also carry the tree trunk sized collision that is the Ogryn’s arm.