And it was the engine's fault?

Come on, be serious. There are so many variables that affect the engine's performance, in the hands of the person setting up the engine, tank and/or the plane...

I have hundreds of DA-50R flights on about 6 airframes, without an issue.

I would not fly the plane unless I feel the engine runs properly on the ground and I would not go down low and inverted unless I feel the engine is properly broken in and the transition is perfect...

So if it's a new DA with only 2 gallons of Ashless through it and the mid-range is still burbling a little, I will not go down low and inverted and or do anything that might put the plane/engine in jeopardy...

When you have a dead-stick, you bring it down and do not fly anymore until you figure out what caused the dead-stick (unless you run out of gas). This is simple common sense, and if the situation continues, you can send the engine to DA who will test it for you and tweak it for FREE.