No video of it, but since my last post I've managed to learn how to do a "respectable" rolling harrier circle. What I've found is the inputs are the same as a rolling circle, but the rhythm is different. In the rolling circle, I tend to be holding rudder a lot longer than elevator. In the rolling harrier, it's the other way, more elevator than rudder. I'm using high rate elevator, 40 degrees or so, I tuned my ailerons high rate down so it didn't roll so fast, and rudder on high rate to learn. Now that I've mastered it a bit, I'm using he rudder on low rate which is probably 30 degree throw or so. Someone mentioned the WH planes like a blip of throttle while on their sides, couldn't agree more. It really helps to keep the nose up.

My DA50 had a good burble in it while inverted when I was first learning the RH, and I couldn't make any progress. Since then I added a piece of brass tubing to the diaphragm cover and vented it inside the fuse. No more burble when inverted, and the first time I tried the RH after the mod, I couldn't believe how much easier it got. I was loosing too much prop wash over the control surfaces while inverted and I couldn't keep the nose of the plane up. So like Silver said, prop selection could very well make a big difference if I noticed that much difference with the variation in engine speed.