By reducing the transfer port to .125" your going to decrease port volume by 28%! That will increase your peak pressure by quite a bit. It takes quite a bit pressure to properly obdurate the skirt into the grooves of the rifling. Better skirt sealing, better volumetric efficiency. Your idea of the carb style jet sounds practical. The chamber side should reamed/chamfered for smooth airflow. The barrel side should be center aligned with the bore centerline of the barrel. You'll want as perfect a seal on the breach as possible. Last but not least is the muzzle's crown should be very closely examined for imperfections. I mentioned the RWS Hobbys for a reason. Even with all these improvements, you still won't have a lot of volume to create power. The Hobby's are light will probably make better power than any other pellet in these springers.
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