Shadow Map Stitching problem

Hi.

I’ve been following this tutorial:

http://www.paulsprojects.net/tutorials/smt/smt.html

which is really good and clear, but I’m getting horrible stitching effects on my scene that I can’t get rid of, even using

gl.glPolygonOffset (1f, 1f); 
gl.glEnable(GL.GL_POLYGON_OFFSET_FILL);

Here’s a pic:
[img=http://img101.imageshack.us/img101/5247/picture6vm4.th.png]

My model has a high poly count (350,000) and lots of curves, don’t know if that makes a difference? Quality seems optimal at 1024 tex size - with 2048 the stitching actually gets worse.

Any help would be gratefully received, if I find a solution, I’ll post the code here.

Cheers.

Matt