Did 15min at a somewhat relaxed pace with a longer stroke to start greasing the groove, and one thing I noticed is that if I get my hands away quickly, it's easier to tilt my pelvis forward. The arms shooting forward seems to help 'drag' the pelvis forward, while if I move hands away less quickly, it seems like more muscular effort is required and even then I don't get quite as much pelvic rockover as I do when I move my hands away quickly.
Is this common?
A cantilever from a central structure moves the c.g. of the combined system toward the exterior of the central structure and possibly outside it. It follows that a sentient "structure" might observe that extending lesser body parts reduces the perceived effort of rotating its upper stories about the pelvic pivot in the direction of the cantilever. ¿Quien sabe?
15' of seat time finding out for yourself is what I like to hear.