Curtain Wall Gap at Mullion - Not trimming to profile correctly

[MaddMatt]

Hello, I had some luck with a previous question so I'm back at it again...

I created a very simple mullion profile, approximately 1.5" wide by 2.75" deep.  It was easy enough to load into the project, but there is a gap between the edge of the panels and the mullion.  Per the note on the profile family "Curtain Panels are trimmed to where the profile sketch intersects the Center (Front/Back) Ref Plane", but mine are leaving a gap around the boarder of the curtain panel.  Frustratingly, I cant get the panel to trim at the edge of the profile.  See attached images for reference.

Thanks in advance... 

[MaddMatt · Accepted solution]

Problem solved... 

My new profile was not overlapping "Center Front/Back Reference Plane" enough and the curtain panel would only partially intersect the mullion profile.  Lesson learned, center my profile on the reference plane axis and offset as needed in the project.