I wish there was more clear documentation on Midi Implementation in VSTIs.
I started with an eight port notebook computer. It was so easy to use. Eight Ports, 16 MIDI channels per port.
Then I moved to an eight port MOTU midi interface. 128 Midi Channels over eight ports.
Put the master controller keyboard in to Local Off, Omni off/Poly and you could move from track to track and it was all so easy.
I’m just getting into VSTIs and I love the sounds and features, but the lack of clear documentation about basic Midi implementation is really troubling and annoying. So, good luck with it all and I"m sure you’ll get it worked out. It sounds like you’re well on the way.
I, too, will put the same instrument on multiple tracks and also find it useful to use multiple instances of the same instrument and patch on multiple tracks. So, if that’s how you’re going forward, I think you’re on the right track.