The only way you can increase FPS is via a new inner barrel.
I run a 6.01mm or 6.02mm [I forget its a male leaf] tightbore on mine and I get about 320fps
I'm imagining your running a stock barrel which might be bigger than that so you'll be getting a lower fps reading for sure.
Also if you dial your hop up correctly you may increase FPS as well. I found from experience if there is no hop I get very low readings.
Its worth a shot looking into to see if you are actually having issues.
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