leave it alone - they were likely just concrned about possibly making the thing loop - remember these planes were not ARFS - they took time and work to build and so flying had to be carefully done
many times a poorly trimmed plane would go into a series of dives n climbs and hopefully this would not happen as a "stalled loop" attempt may be that last maneuver seen- before the model crashed.
No on line forums either -
you took it slow n easy
I started free flight in 1950 and had no one to help me either so I made some real boo boos and these always resulted in lots of work going into the trash.
Trim flights were short and with power settings carefully "guessed at "