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Take a close look at the nozzle. The guide rod screws up into the bottom of the brass base of the nozzle. There's a portion that sticks through. The more that part sticks forward, the further up the float valve will be positioned. More forward = less FPS...further back = more FPS.
You can take the nozzle apart and grind down the stub of the guide rod that protrudes through. Leave 2-3 threads or you might end up with the float valve sitting too far back and it might not slip forward properly into the nozzle tip.
All the way back is pretty close to 600fps with propane at room temp from a 363mm barrel.
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