After almost two years I finally figured mine out...unfortunately its quite hard to tell without a quick teardown, but my problem was my LCA shock tabs eventually wearing down and causing a minute gap, thus every time the shock had motion, the clunk...if you have a free day take a look there and check for damaged ball joints too while you're at it...
*and if you haven't already considered some LCA spacers from Greg, may want to look into that too...
*and if you haven't already considered some LCA spacers from Greg, may want to look into that too...