I have a 912 ULS on a KF5 with a 72" IvoProp and cockpit adjustable propeller. I've been told I should run the engine up to 5,800 rpm and set the prop to 5,600 to fly. I tried this and could only get the engine rpms up to 4,800. I've flattened the prop as much as I can. I've read other threads that suggest that this might be a prop length issue. Does anyone have any experience with this problem? What was your solution?

Maverick