I don't know how I missed this thread! I own two Crowns now, a 600mm that I bought from @Bob_O that has a gen 3 reg and a new 700mm (also gen 3).
I'll get some overnight creep sometimes, but it goes away after the first shot. I have seen the pressure jump 2-5bar when I tap on the reg gauge, mainly in the 600mm, but those gauges are the older white ones and I have a new set of black ones waiting for me to prioritize their install.
Regarding what @sniperlabyo's feedback, I'm really curious about the new reg materials! I bought a new extra-high Huma when I bought this new Crown, but with my 12.6 gram hammer weight and modified spring guide, my ES is usually 3, but never more than 4 shooting 30gr slugs at 970fps at 170bar. Lately, the wind has been calmer here, and I have been running 158-160bar with zero creep and identical ES.i also feel like ES could be lower if I paused longer between shots.
That said, one time I left my reg at 180bar and it crept to around 190 overnight. That had me wondering about the creep issues that others have posted about, and whether or not the creep is tied to making frequent reg adjustments - or changing the reg pressure settings for a different tune. I started to wonder if my reg would exhibit that behavior if I left my rifle on 158 or 170 for a month's worth of shooting, and then decided to detune it to 135 or whatever.
All I know is that these gen 3 regs have been pretty good for me. I'm tempted to take my reg out now to see what materials the piston is made from, and to see if mine has these other changes that @sniperlabyo speaks of - but meh, at this point I'm not planning to touch it until it's time for me to service it.