[Freesurfer] How do Control Points and Pial Surfaces Interact?

Hello -

I am trying to compare normalized segmentation stats across groups. We are adding control points to the white matter in an attempt to push out the pial surfaces when it appears grey matter has been clipped or cut short. I am loading the following:

tkmedit [SubjectID] brainmask.mgz lh.white -aux wm.mgz -aux-surface rh.white.

The CPs are being saved, and after running autorecon-all the CPs are referenced in the recon-all.log file - however the pial surfaces are not redrawn around the control points.

Should the white matter CPs force new pial surfaces? Am I missing a step in here?

I checked the archive for the last year without luck - so I apologize if this is a repeat question.

Thanks much for your help - Sherri