Biggest thing with the dual regulator system is there is no reg creep at all. All of my other fx rifles like the impact and wc3 had some creep. Even brand new they had some creep. The maverick doesn’t take 2-3 shots to to stabilize the regulator, it’s spot on every time
Agree with @2L8 Regs can creep, doesn't matter if you have one, two or three. Creep is creep. Regs operate by a pressure differential between the supply pressure (bottle or tube) and atmosphere (hence the vent holes that all airguns with regs have). Most use Belleville Washers as springs and distance from pin to seat to control actual set pressure. Whether you have a single reg, or two/three in series, they all function the same...
The .22 Maverick is easily capable of 70 FPE without much work. Heavier hammer weight plus setting the reg presures to 190/150 will do the trick, assuming a 700mm barrel. The one I recently got used has a 600mm barrel and power is somewhat less, but still very good (65 FPE). I installed a .22 barrel 700mm from an Impact just to test and 70 FPE was what I saw on my gun. I'm going to install a larger Ernest transfer port and a Huma pin probe just to see how much I can get with the 600mm barrel.