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The CA25 in general has very poor air seals. The air seal nozzle is designed very poorly, and the piston head is absolute garbage. Air escapes all around it. The cylinder to cylinder head seal isn't great, either.
I've tested that spring in other platforms, and it should be hitting around 420fps in a properly sealed setup.
Swap the piston head to another aftermarket ventilated piston head and the air seal nozzle to the G&P version and you should get above 350fps.
I recently overhauled a CA25 and got it to 380-390fps.
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