First build ,cat D11

[9W Monighan]

I watched your video and it seems to me that your blade being a carry blade cannot lay back far enough to get a full load. It's acting more like a straight blade. Think of a wood plane slicing off a chip. Your blade can't penetrate into the dirt at the steep angle it's at now. Well the dirt is wet and loose like you said. Maybe if your push arms were longer a tad to give the blade more room to lay back between the radiator grill. Or change the cutting edge to a lower angle. It would be interesting to see it in some dryer material not sand.
I had to play around with my tooth angle on my dragline bucket to get better penetration and get a full bucket.
Hope this helps.