i recently installed a breuer 8c on my micro seiki rx1500, i needed more height actually and installed a 1/2" spacer under the arm base to raise it up at the back end. however, in your case, there should be lots of space to lower the arm. did you loosen the arm cueing mechanism? that will definitely have an effect on how the arm sits. it slides up and down around the mounting base to accommodate the various heights of the arm. to answer your spacer question, my arm did not come with any spacers, so i don't think that it's a breuer part.
don
don