It may help to water treat the jacket. Being real leather, if you dampen it, it'll shape to the body better much like a 1:1 jacket will after a light rain/breaking in period.
I was thinking of that... but I have two concerns: 1) losing the weathering, and 2) will the leather swell in anyway?
It does seem like whatever Dane did to his jacket to darken it has made the leather appear "fuller" or thicker than others.