Hi @canadabob. This informational article from verywellhealth.com may help give you a better understanding of MGUS and why the M protein plays a significant role in this blood/bone marrow disorder.
https://www.verywellhealth.com/monoclonal-gammopathy-of-undetermined-significance-4771132
Long term, a hematologist would be a more appropriate specialist for you if there is any progression of your MGUS.
A hematologist is a doctor who specializes in researching, diagnosing, treating, and preventing blood disorders. It might be time to add a new doctor to your team, what do you think?