BB ingnition timing

ok guys, got something done to this dizzy. welded the slots and opened up to around 20° crank advance....went a little too far, now it´s around 22° fully advanced.

I also changed the heavy black spring with a light silver one that was left from a kit. I adjusted it to 15° @ idle, is making 37-38° fully advanced.

The pinging is 95% gone, only thing is when i floor it in first til 5000 rpm (no pinging) and shift into second then a slight short ping is there. Could it be that the light spring is not able to pull the weight back for less advance? I´ll try the stock spring again, if it does not work i´ll have to go trough it again to adjust less advance.

Michael