I have a FabCo Air regulator and mister. It works fine. I think i got em for under $200.. you can find the equal parker ones on ebay for under $250 for both. I have a Parker Mister if you want one for cheap. You don't need the mister really unless you arent running it everyday. Member Ponway has a CAT in his Western Stat truck he modified in. He doesnt run one cause he drives it everyday. The Orings do stick pretty bad. Mine every so often has air dump problems. I have the mister set to low setting. I also have an air dryer and 2 tanks for the transmission itself.I am still working out some bugs in my newly acquired M920.
Some electrical issues like the fan motor is toast.
All the dash controls for heater/vents are seized up.
But, when looking at your build, and that of R Racing, you both used some seriously overkill pressure regulators/oil misters for providing clean air/oil to the transmission.
My question, is $500 really worth it for these two parts?
I can find really good components for $100 to $200.
Not sure if the parts you used are worth the premium price tag.