Thanks Robert. I used the same technique and ended up with a point towards the front of the open space. My issue might have been related to using a Pixhawk FC from a previous project. I have since cleared PIDs back to the default and will give it another try. I experienced severe toilet bowling, even though the compass calibrated without a problem. My concern is that HK used a quad configuration in the video, and wondered if the Arducopter V configuration somehow compensates for a different COG.
I am very pleased with the materials and construction of this kit. This is a very light weight and sturdy frame. The motor mounts appear to be quite durable and strong. This compares very favorably and I think slightly better than several Tarot frames I have built.
Did you get your carbon blades from HK as well? Do the 15" blades completely clear the canopy? My 15" carbon fiber blades extend an inch or so over the canopy.