One more thing... in looking at the output from my previous screenshot, you'll see the baseline of the font seems off making look a bit like a ransom note. When I used this previously with BMFont (with only using the 'recommended' settings for NGUI) it looked correct. Do you know if there something else I can tweak to make this more even?
Oh I see that, like one pixel clip.
The char uv info is from UnityEngine.Font, there's not much we can done for this.
Font's texture's filter mode is unchangable either.
Only one thing - the font's importing settings has a Rendering Mode option. I tried OS Default, but the result is like shit.