Fidelity Research FR64s Headshell dilemma

Thanks all.  I bet the Arche head shell would work!  I was re-reading the SmartTractor instructions and the two example tonearms are the FR66S and the FR64S.  The man likes his Ikedas.

I use 231.5 P2S with the 64S and Baerwald. I use the Arche Headshell that allows me to slide the headshell in and out giving me about an extra 10mm of adjustment. This essentially makes the headshell longer.  At 231.5 and Baerwald the cartridge is straight in the headshell, and the Arche gives enough adjustments where my Koetsu is still tucked under the headshell instead of awkwardly sticking way out in the front.  I use the Smartractor and tried Stephenson and UNI-DIN and still think this setup sounds the best for me.

advanced&karl_desch, Assuming that you are not familiar with
Arche you can buy extra insert pieces on which the cart is installed.
This way you can use the frame as base and pre-adjust as many
carts as you like. It is like owning many headshells in one.

And I had the opposite problem to the OP - had to push Decca Reference all the way back in AV101 on FR64S at 231.5 P2S and even had to push the the AV101 loosening the azimuth screw and finally remove the gasket (anyway recommended by the FR manual) to get a reasonable alignment. I was using the Nerve Audio copy of the Dennesen protractor and sort of cross-checking with the Mint (Decca’s have no cantilever so only the arc). My P2S is actually a bit shorter, closer to 231mm as this is what my setup allowed. I guess much depends on the cartridge as all have different "effective lengths".

Bu why do you change manufacturer recommended PS from 230mm to 231.5 mm ? 

This 1.5mm can be easily adjusted in the headshell with recommended 230mm PS