CubicsRube
Hero
What about adding piercing resistance/immunity to monsters? Or give bludgeoning/slashing vulnerability to monsters? I haven't had an issue with DEX based combat in our sessions.
I would suggest resistance to slashing and piercing for heavily armoured foes (natural or otherwise). When fighters wore plate, halberds, mauls and other heavy weapons were very popular simply because they had the ability the penetrate heavy armour.
While d&d does like to give finesse fighters an equal footing, there's no reason you can't weight this back towards heavy weaponry. This will naturally make strength a more appealing stat.