You probably want to have both extruders heated up at the start of the print since it can take several minutes for a nozzle to reach 230C. You wouldn't want the other nozzle sitting idle that whole time.
Click "edit process settings" and then choose the "PowerSpec 3D X/Pro (both extruders)" profile. This is the profile you should be using if you are printing with both extruders, as it is already configured correctly to heat up both nozzles. Look at the starting script and you can see the commands that they are using.
And I've noticed some big improvements too, so I'm glad you're also getting better prints! I talked to some of their developers, and it sounds like they have more on the way too!!