I have the same problem with crookedness in the saddle, and have to keep checking every so often that I have equal weight on both seatbones, and that I'm not locking my knee and ankle joint on the one side... But like you say, if you get it right, the legs just drop quietly into place.

That's a spectacular building. It's a shame that I always have trouble with the chunky muscular figures on panels on buildings of this date - too reminiscent of what was to come in Germany a few years down the line. I can't see them with an unbiased eye.