I downloaded MidiViewer and captured my aftertouch events from the kit in there too, so I know it's working from the kit to the PC.
Far as I can tell, it's the SI-Drum VST that comes with CbB that is holding the aftertouch events up. The kit is transmitting them to the DAW, but they're not getting translated into SI-Drums. Don't see a way in drum map manager to add aftertouch events, so I think I'm screwed.
BFD Player works with the aftertouch events, so I guess I'll use that. Shame the SI-Drums doesn't support it, ya get what ya pay for I guess, lol.