The answer to any and all of your customization questions lies here:
http://twu.tennis-warehouse.com/lear...tomization.php
This tool will provide you real statistics and suggestions on how and where to place lead to achieve the type of racquet characteristics you desire.
If you add lead at the handle and cannot put it in the buttcap I suggest wrapping it in a single layer around the base of the handle directly against the frame and underneath all grips.