depended on what you are printing, for larger prints ( which is the optimal type for 200 ) over curing can be beneficial for better structural integrity. So small print under curing can produce finer detail.
New Asura has feature that overcures the supports only, which can help with large jobs. this only works with Asura supports. ( for now ) @peopoly I would still like to see a manual way to select external supports for over curing in future.
Very happy to see your first prints came out without problems!