Fidelity Research FR64s Headshell dilemma

Addition, Typical example of referential opacity is Orsonic.
There are 3 versions : AV-1 ; AV 11 and AV 101. Those are 3
different ''animals'' to which is referred with the same name.
So those who don't like ''Orsonic'' probably mean the first light
version AV-1 . Its rigidity is obvious problem. But AV 101 weight
14.5 g and looks very sturdy (aka very rigid). 
The other way round is the case with Jelco HS-25 . This one is
offered under different names but with  the same bearer . Sumiko
HS- 12 is identical with HS-25 and some other. All with different
prices. So when one has not idea to which object an name refers
one can't know what he is talking  about.  I have seen Sumiko
for $30 and Jelco for $80. 

I have an Fr-64S.  I have a couple different alignment protractors but last year actually started using one that measures P2S distance (SmarTractor).  So I set the P2S to 231.5 and like the OP, was unable to get my cartridge forward enough in the head shell to set the overhang correctly.  I was using a Ortofon rosewood head shell.  Had to set it at 230.0 to achieve the overhang.  This strikes me as strange because using an arc protractor, I was able to use a Baerwald alignment. One of the two must be incorrect?  Probably the arc.

Oh, and the cart I was using was the Koetsu RSP.

AudioCraft headshells are excellent (after rewire) !

karl_desch, I think that you are confusing ''effective length'' with
''overhang''. Effective length is the distance between the stylus 
and the pivot which is by Bearwald 231, 5 mm. On your Ortofon 
headhshell there are slots along which you can move the stylus
in both directions in order to get the right distance to the pivot.