I've been reading a lot about opening sets and approaching because I have some AA I'm trying to do away with. Last time I went out, my friend and I had no issue approaching and opening several sets, but it was hard to keep groups with 3+ people fully engaged.

Should opinion openers like "How long should my friend wait to start dating one of his ex's friends?" be directed towards one person in the set (not necessarily your target) or everyone?

If it's everyone, do you usually just wait for the flow of conversation to give you a natural transition to shift focus to just one person?

Is it ever acceptable to open one girl from the side in a group with 4+ girls?

I feel like my game with sets made up of 1-3 is alright, anything higher just feels difficult though. Thoughts?