I was leaning too far back at the top trying to keep my combined center of mass (CCOM) over my base but I was doing it the wrong way and it was making me work much harder than I needed to.It was restricting my back swing and overloading the hips too much by themselves. This technique lets me get my hips and legs into play much stronger and increases back swing instead of inhibiting it.
It feels like I have a "launching pad" to jump off from now. WAAAY stronger and easier to produce higher force.
After 13 plus years of basically specializing in the one arm swing I'm still learning. Still refining. It's all easy til it's heavy is true. The desire to maximize the speed power and endurance of this maximal weight requires I figure all the details out perfectly.
But this was the strongest of all the 48 kg sessions. I just kept saying to myself, "swing it like it's a 44" which doesn't psych me out, while this does.