I've got type 3s that run consistently on 2 or 3. My 16"grendel with the wolf needs to be a little higher. Suppressed 300 is 1-2, 3 depending on ammo/ can combination. I wouldn't worry too much about which number setting it's on. Turn it as low as well allow for consistent cycling lock back in last round. Some will bump it up one past that for "reliability".
Each rifle/ammo/dial/port combination is going to be a little different. Figure out what works for your setup.