I'm having a similar issue with my Timefactor.
I tried everything you suggested and my results are different:
When I connect GTR in the mono input, ouit of the mono output I have Delay A and Delay B…that's normal.
When I plug a cable into OUT 2 and not into anything I still have Delay A and Delay B if both are ON.
If I plug the input to the amp on OUT 2, I can still hear the same as the previous tests. NOT only Delay B.
What should I do? I'm running V3.0.
Thanks in advance.