So you are actually running TWO diff DAWS on the SAME Mac and TWO diff interfaces and are wondering why its not syncing up?
Any time you loop midi out to midi in you will have a delay as well.
Good luck Dr. Fletch, Im all out on this one. As I said, ALL three DAWS I ran here with CUbase synced locked up just fine
Locking the audio clocks via wordclock for the two interfaces will lock your audio so over time they will be in sync, your transport on the other hand