I love sumo! Looks pretty darn good, on the first video before you grab the bar your hips are slightly higher then when you pull, play around with leaving your hips int hat higher position, so more of a hing and less of a squat, see if it feels more powerful it’s also less range of motion. When bringing in your stance just pay attention to depth. It’s hard for me to judge based off the videos, It has the potential to cut off depth and not let people get that extra inch they need to break parallel, in turn makes it feel more powerful because the joint angle is different, but might not be deep enough.
