Hi Lcooley,
Need to ensure batten tensions are not so slack that they may escape and not so tight that they struggle to pop through in light winds or produce too much depth.
Just tight, but not taught - just take to creases out - is about right.
Removing battens is not permitted. Similar to sailing without any piece of standard equipment, it is not permitted unless specifically specified.
Sailing without the batten may de-power but in an inefficient way and it can't be good for the sail. To lose power out of the leach try giving the downhaul a good pull instead to open the leach up.