C-Peptide is a by product of the production of insulin. Since you were not fasting it is to be expected your number would be highish if you are producing insulin. Here's a good explanation of what C-Peptide means and how to interpret results depending on if it is fasting or not. It would be interesting to know what your blood sugar was at the time of the test.
Some people think C-Peptide helps protect against complications, so your result may be a positive.
I know the antibody tests are not fool proof, but they would point to T2 which means you have insulin resistance by definition.
I love playing arm chair endo, it will be interesting what others say.