Unfortunately neither solution worked at the moment. Spline Thicken is a difficult node to understand… I tried toying with it, but the biggest problem is that any Particles with WPO applied seem to not draw in Wireframe mode, so it’s hard to tell what’s happening.
EDIT: Solved it. I think I’ve basically replicated what Spline Thicken is doing. I use the UV’s to distinguish the verts at the top / bottom of the Spline, and the Tangent X-Vector as the direction to multiply the offset in. It’s currently backwards, but it appears to be working perfectly.
