my .177 WC is setup to shoot at 19fpe and the reg pressure is around 110. I don't trust that number as I don't trust the gauge. But a true 140 is high for a .177, maybe even a .22. I will say that mine came shooting at like 25 fpe and I was lucky to hit a 2" target at 30y. When I turned it down (which is an exercise in frustration with the pre 'amp' reg) I doubled the shot count, it got much quieter, less wasted air, and I can shoot 1" at 55y with JSB 10gr when the wind is calm. I went through 3 .177's WC's before I found one that shot well (all pre AMP, pre STX).
I have Huma reg waiting to install but my settings are holding so I'm not touching it. I have a better gauge to check pressures with now but it might be a while.