Hi here I have inverted the stock motors and using the X 8 lower props made it fly just fine,I noticed a longer flight time as expected and nice smother response, no need to adjust any pids. In the mod I did not use the X 8s motor mounts by using the normal mounts by machining out the screw mounts of X8s . Also the esc leads where reversed. Later i will install 4 38 mm prop spinners on top every motor for better flow and looks better. Cost just the props.