The cut capacity has been proven several times over. There's a video of it cutting 1"+ online as it is. It's not fast. What is your air pressure and actual input voltage? Are you running on a generator? What is the standoff height you are using? It should be less than 1/16". The filter/water trap looks smaller, mainly because the regulator is mounted on the front. Less mechanism is required.

Not sure what to say about the roller gauge not fitting. Never heard that issue before.