Albert, when you said:
"For tangential arms like yours, overhang is achieved when the stylus is set exactly on "that" line all the way across the record."
I presume it was with the understanding that you meant no overhang.
In my three different tangential arm experiences, the cartridge was mounted on the arm so that the stylus lined up with the center of the platter spindle. It would not make any geometric sense for the stylus to overhang the spindle. Doing so would create tracking error all the way across the record! Overhang only applies to offset pivoting arms so they can achieve two points of tangency across the record instead of one -- a whole different kettle of geometric fish, unless I've been missing something for the last 45 years?
Go to this page at the Vinyl Engine:http://www.vinylengine.com/library.php?make=Goldmund
Click on the T-5 arm manual, and then download the PDF file for the T-5 instruction manual. On page 8 it makes it very clear that the stylus must pass directly over the center of the spindle.
PS: The T-5 is a PITA to keep in adjustment and from what I hear, not that great sonically (unlike the Reference T-3.) I bought an SME V with my Studietto, and never looked back.