The only insight I can offer is to stay on your bike. If I'm off the bike a few days, then go ride, I notice that. If I'm riding all the time, no problem. Seems to be just a flexibility issue in my case.

I do noice also that when I ride, even with my hands in the same position, I can bow or straighten my back to some extent- not sure if that related directly to more comfort for me or not, though.