Makes sense to me -- you changed the setup - by adding the non lifting devices
Breaking my promise. Sorry Dick[8D]
Naw, no setup change. Just "created" an inefficient prop in an extreme example who's results should be extrapolated into a comparison between my new shiny APC and an old Top-Flite nylon that my dog chewed up, and further extrapolated into a comparison between my shiny new 18*6W APC and my shiny new Master Airscrew 18*8 classic.
The APC is a LOT more efficient at hover than the 8-pitch, uses less power to create more thrust, thus creates less TQ roll.