power valve makes my 440 ping??

Hi fellas, I was tryin to tune out a little rich running condition in my 440 a few days ago, I was running #82's and a power valve blank in the primary, so I dropped to #74's and a 6.5 power valve.
now it detonates like crazy! I backed the timing down little by little now its 25 deg total, 4 deg initial, still Knocking! I jetted it little by little right back to #84's still pinging! dissconected the secondarys still pinging!
Im really not shore what to try next? any ideas??