Eased off the modulation on the two lowest trombones (now a bit more mellow during the final section), bumped up the volume of the tenor during that segment. More tweaks to trumpet line. Now it sounds "lazy" - might need to try having it play a bit ahead of the beat?
This is REALLY HARD. When playing with a group (or singing in a choir) you naturally adjust to those around you – this is much harder to tweak each track independently. I have a lot of control over these samples, but I can only get them "so close" to realism - and listening to this piece over and over (and over) is lowering my opinion of it :( )