Hi Ahornberg.
Thanks for the response and for your work on these devices 
I don’t have any reason to suspect there is anything wrong or out of spec with either of the modules. As I said they seem very well designed.
I’m more inclined to believe there’s some bug occuring in the interface between Live and VCV.
Yes in Ableton you need to reset pitch bends to 0 or they will stick, but that only applies to conventional ‘global channel’ pitch bends. The implementation for MPE bends appears to be different:
When manually sequencing MPE bends in Ableton, the bend curves are restricted to the boundaries of the note and will never stick or span multiple notes. Ableton seems to do a good job of inaudibly resetting the values.
I’ve programmed MPE sequences like this into dozens of synths for years and I’ve never seen this behaviour, something is definitely wrong.
Besides, this erratic behaviour is not just the values sticking. The jumps are occuring even when no pitch bends are present, although the bends make them much more frequent.
May I ask, in your testing, did you try programming sequences manually and playing them back into VCV via a plugin host?
It is late for me but let me get back to you with a better demonstration of this problem.
Thanks again for your response and for helping me get to the bottom of this.