I think the boarding groups are too big. 30 people at a time allows for many people to 'slip in'. Maybe groups of 10 or 15?
What I would like clarified is what happens when my family travels with me? Can they board in the 16 - 20 group or do I have to board later with them? I have taken my son with me and him board when I was in the 16 - 20 group but Sunday I take the whole family.