DJI Naza & TBS Discovery First Back Loop Attempt & Fail

For starters, any back loop pointers are welcome! As you can see in the vid I didn't start off with enough backwards pitch, which caused the loop to be really big. This ended up with quad leveling out right as it hit the ground. The two back legs dug into the ground and I feel like if I had another 10' that I could have pulled it off.
I decided it was finally time to try this in the field. I've been working on back loops in my backyard with the Blade mQX, but it's so much lighter and easier to get around than with a heavier quad like my TBS setup. I feel like I was pretty close, but you know what they say, "close only counts..."
Ideally I wanted to try this with my F450 frame, but was too lazy to assemble it so I opted for the TBS back loop. The good news is that the 3D printed leg extensions took a majority of the impact and only a zip tie was broken (other than the two rear props).
Like I said, pointers are welcome and I'll be making another attempt soon!