I think my characters have used all of these at one point or another. Depends on how flowery you're feeling, in my opinion.

Not everyone demands the highest standard of RP 24/7, especially when you're basically discussing an OOC mechanic. The whole discussion about grouping is basically some form of "hey, you wanna get together in groups of three to kill these guys because for some random reason it's optimal exp?"

Yeah, you're right, there are definitely better ways to say it, but you can totally understand what he's asking you for, and why. Not a big deal if someone is a bit too zonked out at the moment to rephrase it in a more entertaining fashion, imo.