Belle nuit and DVDSP subtitles poor quality Problem

Hi all,

i've got a problem with my subtitles in a DVD which i'm creating in DVD Studio Pro. First i tried to create my Subtitles directly in DVDSP, which is a bad idea, the quality of the subs is really bad.
Then i tried with belle nuit, created TIFF-DVD files, exported an STL Grafic file, but the quality is still poor. I still have jagged / pixelated edges, no clean Subtitles for my DVD.
I also tried the Demo Version of Annotation Edit, same bad result, and inverted alpha problems.
Here my Belle Nuit Settings :

Font : Arial Narrow (i'v tried several fonts, but no one got me a good result)
Size : 30
Border : 100% Width : 2

I've tried to export alson a normal PAL and not PAL DVD, it's worst.
Also tried to export Only TIFF or BMP, even PICT, nothing's working fine ...

If anybody knows what i'm doing wrong ....

Thanks