Somewhat abundantly (περισσοτερον τ). Comparative, "somewhat more abundantly" than I have, in order to show that he is as true a minister of Christ as his accusers are. Concessive (conditional) clause of third class. For εαν τε see Romans 14:8.

I shall not be put to shame (ουκ αισχυνθησομα). As a convicted impostor or pretentious boaster (Plummer). First future passive, singular number (not literary plural as in verse 2. Corinthians 10:7).