It may be down to the pellet fit then. I cannot remember the article or maybe it was on here, BTDT wrote about it, but it may be that the pellet is starting its travel at a tricky part of the cycle and while it might be possible to shoot it accurately with a super-consistent hold, it's not something an actual human is capable of. If the pellet releases at a more forgiving point then maybe that will work.
Maybe try a different pellet, seating the pellets a little or sizing them. It might be more beneficial than coming on here and being told you don't know how to shoot a springer.