Tested with the Muscle Augmentation CBM and the Hydraulic Muscles CBM. Melee damage on stat screen remained at 5 after installing both and activating Hydraulic Muscles. Carry weight went up. Base HP stayed the same, but I imagine that’s intentional. Still couldn’t smash the wooden benches in the evac shelter after activating the hydraulics.
Also, don’t know if this helps or not, but I first noticed this playing 0.C and tested it in the experimental after.
Well, an axe-kick shouldn’t ever do knockback as it’s dropping your heel onto the target from above. But apart from that minor detail, yeah, this is a bug and thanks for reporting.