Tuning FX Dreamline .22 max energy

I have my .22 dreamline currently running around 45 fpe. It is a 600mm, huma transfer port, heavy spring, slug probe, power plenum. It is sitting at 160 reg pressure and close to maxed out hammer spring. You could probably squeeze out another 5fpe but I don’t think the .22 can pass 50. Someone else can chime in. At my current setting it is a laser with .22 hybrids.