Quick Create Issue with Contact to Contact Relationship

I've created a new Assistant field on our Contact entity to provide a direct lookup for a Contact's Assistant (the built-in Assistant is a Text Box and we'd like to capture more data).  I've added in the lookup and created a N:1 relationship.  All is well with the world and it works as intended until someone tries to add a new contact using the control.

When the Quick Create form loads, it automatically populates the Account Name (parentcustomerid) as the Contact the Quick Create was called from.  Ideally the Account Name should be the Account of the contact the Quick Create was called from.  I've gone in and tried to adjust the field mapping, but it seems I can't remove or edit the "contactid to parentcustomerid" mapping.

Is there any way I can edit this?  I thought I could perhaps handle it through javascript, but I've been horribly unsuccessful.  Even blanking it out in this situation would be acceptable, but I would only want to do it in this situation (it populates correctly on many other pages).

Any thoughts or ideas are appreciated!  Thank you