Maybe someone can add to this but I believe I read that there is a fix/modification to the RW45 to rectify this issue? Something with a jumper, maybe? I run a Hypertherm so didn’t get too deep into it, but there were instructions on the Langmuir site. Again maybe someone can add to this, whether it is even relevant. Also, in terms of a water separator, what you have would be the minimum. I don’t believe this is your issue but you may want to consider a Motor Guard “toilet paper” filter just before the plasma. Again, I don’t think it’s your problem here, but when you get going it will help immensely with your quality.
Here is the link to the bulletin: RAZORCUT45 Misfire Issue - RAZORWELD TECH BULLETIN 9/23/2020