ICEM Meshing Vortex Generator
 

I have been trying to use ICEM meshing to apply a structured mesh to a wishbone shaped vortex generator but I am not having much luck, producing results as shown.

Any advice/help/tips on what I may be doing wrong and how to improve?
I have been dividing geometry up into smaller blocks and deleting unnecessary and associating multiple lines, surfaces and vertex's to the geometry.

Thanks