I need help modifying some twisted louvres

I created these louvres using a loft command through some rectangular profiles. If there’s a better way to do this, I’m open to suggestions, but the reason I used the rectangular profiles is so I could adjust their spacing via a graph mapper (therefore achieving various rates of rotation) . I then rotated the profiles using a graph mapper as well.

As you can see, each louvre has the same rate of twist across the linear array. I’d like to find a way to vary the twisting across the array—so maybe the louvres at the very ends aren’t twisted at all, but as you move toward the center, the louvres gradually twist to their fullest extend, ideally using a graph mapper as well.

2018.10.17_mcneel_forum.gh (11.6 KB)

2018.10.17_mcneel_forum_re.gh (18.1 KB)

Thank you!

Dumb question, but how do you overlay the Rhino window on the Grasshopper canvas?

Ctrl+Shift+Q -->Export Quick Image

Is there a way to utilize an attractor curve to twist instead of graphs ?