Substande Designer - Flood fill mapper - rotation issue

[1k0lala]

Hi Geeks!

I'm working on a procedural wood log material, so far I can control the rotation of my logs with a grayscale value from 0 to 255 = 0 to 360°.

I use the flood fill family node to map a texture (wood grain, grunge, whatever) with the flood fill mapper node, however, it only uses half of my grayscale value to perform half of the rotation. No rotation of the texture between value 0 and 126, then it performs correct rotation. Is there a way for the flood fill mapper node to use the full grayscale value to perform 360° rotation of my texture?
 

[1k0lala]

Here is the issue in animation: 

[1k0lala]

Using a solid color make the rotation to work. It seems the issue comes from using a shape or multiple shapes on a uniform background, which is needed in my workflow:

[1k0lala]

On a very simple scene, the process work, this is why I'm stuck and can't understand what I'm doing wrong