Please don't do this, this way splashes in fighter or Paladin classes will become too much powerful. Stalwart Defence is a very powerful stance for just 3 level splash and you are removing the movement penalty too.
This is a nonsense... Block and Cut needs "Block"! Please rename that at least.
You get that, with the actual cooldown (20s), this enhancement is a +25% doublestrike half of the time right?