Thorens TD124 with Fidelity Research FR-24 Arm help

Wondering if anyone had experience with this combination?  I picked up an FR-24 due to reputation and well...aesthetics!  Drilled out a new armboard (which barely fit with the 230 pivot to spindle distance) and installed it.  Very excited until I found that it was impossible to adjust the VTA in further to get the cart in the (roughly) parallel alignment.  The arm looks to be nearly 1/4" (about 7mm) too tall.  Like I said, I've taken the VTA adjustment within the arm design down as low as it will go.  Outside of adding a thicker mat or putting a bunch of spacers on the cart (adding weight), I'm at a loss.  Any expert advice is much appreciated.