The key information we were missing was the internal map name, which you have now provided us. I was planning on doing this myself, but my guild hasn't quite made it to that raid zone. Try adding this block to your _User_MapStyles.xml file, and let us know if it works.
Code:
<ImageStyle Name="exp19_dun_takish_badlands_raid_01" displayname="Takish Badlands: The Boundless Gulf [Raid]" zonerect="-1793, -1207, 1901, 1551">
<ImageFrame Source="images/maps/map_exp19_rgn_takish_badlands.dds" SourceRect="0,0,800,600" />
</ImageStyle>