S400f carbine

[Friar Tuck]

With the greatest respect, your first step should be to run a full string of chrono readings, with a few different pellets, including AA Field, over a full fill, to establish the profile - it is unregulated, so it is not flat.

Then, consider why you need to increase the power? Accuracy and consistency are more important than power.

Shoot more, tinker less, learn slowly.....