ZBrushCentral

Frame Mesh - Insert Mesh Curve Brush Inconsistent Spacing

See attached. I am using Stroke > Curve Functions > Frame Mesh - Creased Edges to create curves along which to run stitches.

If I create a curve along one creased edge loop and apply an Insert Mesh stitch, then delete the curve, create the next curve, repeat, everything works fine. The spacing between stitches is consistent from curve to curve.

But if I create curves along multiple creased edge loops all at once and then apply an Insert Mesh stitch, the spacing between stitches from curve to curve is wildly different and unusable. See attached.

I can go edge loop by edge loop, crease, create curve, apply Insert Mesh, delete curve, uncrease, etc. but it takes time. Any ideas on why applying Insert Mesh geometry to multiple curves at once is yielding inconsistent results?