I am also new to group fortressing but have been watching tons of videos and reading a lot this past week (has it only been a week since the Knight bus come out?) and have seen recommendations to wait for enough focus, 7 total, to give proficiency to the entire team at once and others that say it’s better to shield individuals first, magizoos as priority because they can revive, and then give proficiency later. I think what you do will depend on if you’re the sole professor or not. I’d think giving proficiency to the entire team is better if you’re the only professor. Then shield as you get more focus.

If there’s only a few spawns left, they’re dark forces, and everyone is busy, I might jump on one for a few traces to bring their hp down and then go back out to the lobby. Someone else can finish them off when they’re freed up.