Thanks Willy, not 100% sure why your new model made less power the only thing I can think of is you went to hight of pressure with the regulator and the hammer spring could not open the valve enough. I have done that with mine also I had the hammer spring maxed out and couldn't get over 600fps. Right now I have set my regulator down to 100bar and the hammer tension screw is only a couple turns in to get around 660 fps. As for the loudness from my understanding the green handle ones have a shroud that works better, I'm not sure if there is baffles inside those or not that help. On the new model the shroud has nothing to dampen the air coming out of the 3 air holes on top of the shroud. I have thought about putting in some batting that my wife has laying around and see if it helps anymore or not, also might try 3d printing some baffles and see if that will help at all. Even with the donnyfl on there its still got a good bark to it.
I like it for that same reason toss it in the backpack or under the truck seat and got something with you all the time thats fairly quiet with decent power.