Do what all the "good guys" seem to be doing these days... don't put thrust in your firewall and use rudder-throttle mix to compensate... compensates for P-Factor on throttle advance and ELIMINATES tracking problems at low speed or idle!! I tried it per Chip Hyde's suggestion and MAN does it work nice. I use a 2=3% right mix on throttle advance and a 1% left mix on idle... amazing how straight the plane tracks now. My firewall has 0* thrust so my cowl is straight as an arrow!!

I have always battled low speed trim and used left rudder to offset the right engine thrust on downlines and idle entry into stalls... NO MORE!!

On these planes with big rudders, this works beautifully.. !

DP