In terms of creating a better blunt, using the better understanding of physics and made up technobabble available to use is necessary. Memory-steel combined with a flexible handle would seriously crank up the available force, allowing for a "super-sledge". Likewise, applying a wireless enabled super-magnet would make this incredibly powerful against 'wared up enemies. Another viable option, for a large cost, would be an impulse drive attached the back. Rocket-hammer!
The very thin headed warhammers used in the late medieval wars actually did penetrate plate armour, as did flanged maces, by focussing a massive amount of inertia on a small area. This would still be very effective on modern armours, by either punching through if they have a sharp tip (a pick-like hammer) or just transferring enough focussed force to crush whatever is on the other side.