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FX Dream Tac and Redesign Help

I am looking for help with my Dreamline Tac with a 600mm barrel in which i would like to shoot .22JSB Redesign pellets at a speed closer to about 900 fps or better.
i have turned my reg pressure up as high as 150 and maxed out the hammer but can't get more than 877 fps at that setting.
looking to see if there is anything more i can do or is the gun not capable of doing any better ?