Is there some secret to BCLK + pstate OC, pstate OC alone works nicely but as soon as I touch BCLK from auto the board goes into OC mode (pstates disabled). I tried it on both 0083 and the new 0003 bios.
You could always use the DSPlayer builds which are once again under development, see http://forum.xbmc.org/showthread.php?t=106629
I have been using LAV filters for HD audio without any issues.