Cause of elevations in proinsulin, c-peptides and proinsulin:c-peptide ratio, c reactive protein & ferritin. Normal A1c & glucose. Previously overwei?

Can't answer. Nobody here can answer without your clinical history, though i wouldn't be surprised if you have hemochromatosis -- truth is, i hope you do, because it's the easiest of all the deadly diseases to manage. It's also worth remembering that serum ferritin is an acute phase reactant and likely to be high during some other illness. You're a person, not a set of labs. Insist on a full explanation.