Trim bowl for stadium (Bowlbuilder)

I am trying to trim a resulting bow generated with bowlbuilder elements. However, the it is is triming in the opposite direction. I have followed the bowl builder tutorial and can seem to figure it out. Any ideas?

Original bowl:

Pirimeter to cut with:

Resulting Bowl:

For some reason i am getting the outside trim rather than the inside trim as such:

trim with brep stadium building.gh (35.5 KB)