When you instance an object like that, the renderer only evaluates its base object once...but that means the actual particle instancing procedures in the cache base object are only evaluated once...but of course, they would need to be evaluated for each individual instance to properly scatter the particles in their local coordinates. That's not something tyFlow can overcome....each renderer would need to be hard-coded to do local evaluations for tyCache instanced copies. Pretty much guaranteed that won't ever happen.
If you need to adjust instanced caches en masse, your only option would be to do it with MAXScript.
If you need to adjust instanced caches en masse, your only option would be to do it with MAXScript.