Hanging 2-3 was one of the symptoms (along with a bunch of other harsh shifts) when I had to have my trans rebuilt at 62k. It was still there, though less so, even after the rebuild. I haven't heard of anyone having satisfaction after resetting the adaptations, but it's free to try if you have the tools.
Something that seems like snake oil is to try running premium fuel for a couple of tanks. I laughed when I first heard this, but here in modern times when the engine knows the tranny's bidness and the tranny knows the engine's bidness and they both share the same computer anyway... it turns out there is an effect. The engine adapts its ignition timing for the fuel octane and the tranny for some reason knows about the engine timing. At any rate, I feel (subjectively) that the shift points have moved down a little since I started running 91 octane a few tanks ago.