Ingo,

Enclosed are the horizontal adjustments as per your suggestions.  (NOT 
the vertical ones yet.)  To test this, I simply ran mandoc and groff 
side-by-side with both -Tascii and -Tps with each test unit having a 
resulting non-zero length.  They're more-or-less similar, but if we want 
to be precisely the same, there's more work to be done.

Best,

Kristaps