Actually, before I respond again, could you draw some diagram that illustrates how you're doing whatever it is you're doing?  I really don't have any context to go on...
 

• I don't know how you are determining the closest vertex (I can guess at this one)
• or which/how many neighboring vertices (all vertices of all polygons connected to the nearest vertex?)
• or how you're determining thier weights
• or what you plan to do with that information, however you get it :) ).
• or even what, specifically, you're talking about when you refer to your 'shrinkwrap' stuff (I assume it's a script that does roughly the same thing as the shape transfer code in TDMT?)

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