Sixslug, I suggest you shoot a pattern board to see where the poi is. That will tell you a lot.
1. Is the BPS stock the same length as the other guns you shoot well?
2. Check to see if the BPS stock has any cast?
Did the BPS come with any shims to change heighth and cast?
Does the buttstock fit right with your shoulder when mounting the gun? The pitch could be wrong for you, which effects how the gun points.
Answer these questions and we will have a solution,I would think
