And example of your problem:
Pushpull Cessna is know to be 33% more efficient ( climb rate ) when running with pusher prop alone than in tractor mode.
This chosen example includes a quite disruptive variable that has nothing to do with comparing pusher vs tractor. It really doesn't take into consideration the presence of the non-working prop in each case and it's effect. They are variables that affect the outcome. It's just as probable that the rear prop being feathered creates significantly more drag than the front being out. Drag is just as important as lift as important as thrust as important........
Like golf swing..gotta consider all variables to execute a perfect stroke and make a double eagle.
You don't make a double eagle with just your drive, or your approach, or your putt.
But are you after a lower score or a longer drive. The Cessna achieved a lower score with two engines on the same line. It isn't faster (drives the golf ball farther) with just one engine is it? If you wish to consider all things, then consider that the pusher receives disturbed air no matter what. The Cessna example actually does suggest something to that idea. Very disturbed air to the pusher really screws up the efficiency of the climb and evidently operating the front alone isn't as efficient as the rear alone IN A CLIMB. Disturbed air increasing drag appears to be a significant problem with a pusher. And that can cause problems. Be prepared.
It would be interesting to see where you are in your years of development. Any pictures? And experimental results?