Update:
12,000 EDO works perfectly for HALion. I can hear the chords lock in perfectly! That’s because HALion supports microtones. Sadly, VSL currently does not support microtones. Back in 2020, Paul mentioned it is on their to-do list: Synchron micro-tuning | VSL Forum
I never would have known any of this when I was using Finale because I was using the pitch wheel to bend the pitches. For now, I will do without altering the pitch. Eventually, either VSL will receive an update to include microtones, or I will have to resort to MIDI pitch bend.
Thanks again for everyone’s help in this matter!