Just want to make sure I understand. It sounds like your CB sessions are:
- 50% of the time: 2 key UNM, 1 key NM? In this scenario, you don't need to worry about the 4 key situation and the reset times.
- 50% of the time: 3 key UNM, 1 key NM? This is the scenario where you need to use all 4 keys to get all rewards for the day?
Or is it
- 50% of the time: 2 key UNM, 2 key NM - all 4 keys used
- 50% of the time: 3 key UNM, cannot do NM
Just trying to guage how important the 4 key's are to you. If it's the scenario I mentioned up top then I would be looking at what you need to do to get a consistent 2 key UNM. Why does it only work 50% of the time? Does everyone have warmaster/giant slayer masteries, and can you increase someone's damage by adding in more crit damage or something
Also, what was the unkillable team that you were looking at? Maybe we can help you figure it out
The reason I am asking all of this is because I think one of the biggest things that any Raid player can do is lock down a consistent CB team that ideally is 2 key UNM, 1 key NM every day. Do not settle on this piece, because the amount of rewards that your account will get from CB cannot be underestimated. In a lot of cases, CB rewards will make or break whether you can do fusion/fragment events, or even guaranteed legendary summons.
For other content like dungeons you can probably settle for dropping back a couple of stage. For example, if you cannot consistently run Dragon 22 with 100% success rate, then it is fine to drop back to Dragon 21 or 20, and still keep up with the content, but CB needs to be guaranteed each day.
Don't just live with it!