Perp Frame Alignment Issues

Hi there,

I’m reasonably new to Rhino and Grasshopper so this may be a quick fix. I have created a form in Grasshopper by lofting various curves together. I am now trying to extrude ‘columns’ along the curves having deconstructed the Brep. However, given the rounded form I cannot extrude these in one direction / axis. When I create perp frames there seems to be no consistency in their orientation.

Should I focus on realigning the perp frames or is the issue with the way I have created the form (i.e. a loft)? If so, are there any suggestions for creating this form another way?

Thanks very much! Screenshots attached.