Hi!
Didn't you build a layout I made a while ago?
I think Sw2 lugs 4 and 6 needed to be swapped.
You also need an On-Off-On DPDT switch.
I've updated the layout.
Finally I never get a real good result but maybe it's the switch problem, can you give me the link of your updated one, I will test it during the weekend
Search MPF-1 in the Forum.
I've updated the one that was there.
Done another (bigger) layout for the main page.
May get more people building it and testing it that way.