Looking at the video it seems that the MLG actually touches ground for a moment. Elsewhere a tailwind gust was suggested, but looking at the windsock and chimney smoke in the distance, there appears to be no significant wind. Engine sound pretty normal for full thrust setting, rotation very sluggish, and the nose drops immediately after elevators return to neutral. I'd suspect W/B issues here (or mistrim) rather than any incorrect bug settings. Not the first time a container or two that was supposed to be in the rear hold ended up front...
Here is the video without neck pain