Bonjour,
Your topic is very interesting because it raises a question "wet" or "super heet / dry" steam for our little machines.
Personally, as my boats are often too fast, I like using them at 2/3 bars (30/5 psi) with a wet steam to save autonomy and have lubrication even if there is no more oil in the lubricator after a while.
An old "knowing man" had told me that I even could use no oil as soon as steam was wet enough because there is not much effort at 2/3 bars.
My other concern would be that you can have flakes in your copper pipe when heated empty, not good for the plant.
I hope forum members will share their experience on this topic because, as often, we can find several answers to a question.