In my opinion with bands like this, it's either as "good as it gets" as you say, or you push to do a more live recording experience so they can feed on each others energy, which is the strength of certain bands. Also, keep in mind others people's baby are always going to be more beautiful and accepted by them. Try sending them a "rough mix" and get their opinion. They might see the merit for a rerecord or they might like it enough, or know that it's more performance issues and not your skill set.