Tested adding some inductance to pickup with steel 1/16″ thick metal and also a metal spacer. The sheet metal had no difference. The metal space did lower the peak for the no load test but the loaded test was pretty much the same. Maybe added another strip of the 1/16″ may work but maybe it’s the wrong type of metal. Maybe if I can find some metal spacer without holes. Either way I’m definitely going to to add more winds to coils to get that 2.99kHz target peak. That’s the important number to match.