Dan Ranks

I have Dan 2 and I haven't noticed any increase in AoE range, the skill itself still lists it as 10m as well, which is the same as Rank 1.

The best I could do is find someone else with Rank 1 (no Dan) and compare.

While I'm not discrediting your experience, I'm pretty sure the range is referring to how far away you can use the skill, not the AoE

You are correct, I should not be answering complicated questions right after waking up. I'll have it looked into.

I can confirm that the radius for the AoE does not increase for any of the Dan ranks, only the damage it does and the combat power. The current info on the page is correct currently.