Torque convertors do not usually make noises in MBs. Sometimes vibrations and sometimes flexplate noises. The flex plate noises are usually worse at idle.
Its so hard to relay the concept of noise as all noise is some sort of vibration. My first feeling is you have a load related mounting problem or universal/Cv joint problem.
My advise is to take it back to someone with experience and have it evaluated. You should try and drive with the technician and be sure they are aware of the level you are seeing. One of the hardest jobs is to isolate noises. I have driven many cars with multiple noises; some appropriate, some not, but only one bothering the customer.