Hi Bills
Just a fine point. I did not mention turning the prop around, at least I don't things so. If you turn a prop around, the direction of air flow is still the same as it was before. However, the amount of air that is moved is noticeably less. In many cases the plane is not capable of taking off. My Canard uses a Pusher prop with a standard rotation engine. To prevent overheating shortly after initial engine starting, I try to get into the air withing 30 seconds of star- up. If I need to tune the engine, I replace the Pusher prop with a Standar prop, more correcty called a Tractor prop, of the same type, diameter, and pitch, in order that the engine does not overheat. I have never used a reverse rotating engine like you are using, so I may get tthe following wrong: On your reverse direction running engine, running in Pusher configuration, I believe you must use a Standard Prop, more correctly called a Tractor prop, but mounted backward. If all of this is correct, then I believe that in order to prevent overheating while tuning the engine you need to use a Pusher prop as I have described, but also mounted backward. Once tuned, you need to switch props.

All of this may be difficult to follow. It is very difficult for me to write down. If I have gotten this wrong, please someone correct me. As someone once put it, it's all in the details.