Here are the numbers I ran on the training dummy.
Conditions Damage Avg. Die Avg.
No Wraps, No Power Attack, No Wind Stance, Strength 22 (+6) Dexterity 44 (+17) 37 6.1
No Wraps, No Power Attack, With Wind Stance, Strength 22 (+6) Dexterity 48 (+19) 38 6.4
No Wraps, With Power Attack, No Wind Stance, Strength 22 (+6) Dexterity 44 (+17) 43 6.4
No Wraps, With Power Attack, With Wind Stance, Strength 22 (+6) Dexterity 48 (+19) 43 6.3
No Wraps, No Power Attack, No Wind Stance, Strength 15 (+2) Dexterity 44 (+17) 33 6.3
No Wraps, No Power Attack, With Wind Stance, Strength 15 (+2) Dexterity 48 (+19) 34 6.4
No Wraps, With Power Attack, No Wind Stance, Strength 15 (+2) Dexterity 44 (+17) 40 6.6
No Wraps, With Power Attack, With Wind Stance, Strength 15 (+2) Dexterity 48 (+19) 40 6.6

My toon has 5(1d8) so the dice are heavily loaded as you can see by the average per die. Based on my trial, the damage is based around strength - no dex bonus in sight.

Hey Devs - how about a comment (or better yet - just fix it).