Uncle Dave,
I think if globally you can get the Tyros to get that umph accross, then most of the styles are pretty good, some exceptional, a couple are boring.
As for Midi playback, I think with the added eq ( which probably can be saved and sent with each midi file as a system exclusive )and the remapping to the better voices, you pretty much there.
I'm still a little worried about the on board harmonizer but with everything you have to acquire the taste for it.
It is different but both you and I are used to hearing things one way, so maybe we are being too critical. I don't know
Just have a couple of Long Island Ice teas just before you play and then everything sounds awesome