Dividing a tapered surface

Hello! I’m new to grasshopper and I’m creating a wall with attractors. I need a slider to taper the wall at particular angles, which I’ve attached. Except when I divide the surface using Isotrim and Divide Domain, the split that I’ve created to taper the wall doesn’t work. I essentially need a tapered wall, with a slider to change the angle, and then the attractors to be attached to that wall. I would really appreciate if someone could take a look at it.

Thank you!

assignment 2 attempt 8.gh (30.0 KB)

assignment 2 attempt 8_re.gh (40.9 KB)