Greetings. Here is a thread for wiring the 375X with some basic cut guidelines. Cutting 10gauge should be easy peasy, and my guess is you can probably even get decent cuts all the way up to 1/4".
Also, how are the Miller plasmas with their duty-cycle? It shows 35% @ 30A, however I think that it probably very conservative. The reason I ask is that a lot of your cuts in 10Gauge are going to be at full bore, and 4+ minutes of cutting time is going to be quite normal when you’re running the table.
What are the specs of your air compressor? You don’t need anything crazy, but it’s good to know the limitations of what you can do before you decide to buy.
Hopefully those that own a 375 can chime in on the actual real-world experience.