Update:
I took the bow with me to the local shop with me yesterday morning after work (also took a buddy from work and got him shooting some trad bows :D ).
I put 4 twists in the string, which raised the brace to almost 8.75" (most of his bows brace between 8.25" and 8 7/8") and the majority of the shock was dissipated. I could still notice a little, but nowhere near the attention grabbing level as before. Much more managable.
I would imagine that if I were to add a quiver and/or shoot a heavier arrow (as suggested) it would probably be close to complete absorbtion of the vibration.
Since I put a consignment tag on it & put it back up for sale, I probably won't mess with it any more. I just didn't feel right about putting it back up for sale if there was something wrong with it. Now that I know it's still good it's up for grabs again.
Thanks again!!!
-Tony