Av8tor, I just sent you an email.
I'm still using the new Champion.
Also, I flew the PT-19 again today with the APC-18-6W prop.
The engine starts easily and idle's reliably. It runs strong and climbs strong with no stoppages.
Today's tach said the top end was 7,000 RPM.
I can use one click above burble as a comfortable slow cruise throttle setting..
So I'm going to stick with the APC 18-6W for now.