Should the sled be pushed to the forward position before cocking, or leave it floating, and then let the cocking action return it forward?

Reason im asking, my FWB300 seems to have a slightly different consistency and POI (at 25m benchrest) using the 2 different methods.

Also, it seems to be slightly more consistent POI if I thumb the pellet firmly a bit further into the barrel, rather than just inserting the pellet softly. Is this usual? (Falcon accuracy plus pellets)


Thanks!