Imagine trying to explain that patrol to BdU. It will be interesting to see how long you can sit there without counterdetection.
You're braver than I. My late war plan is to get the XXI as early as possible (like you did), and spend as much time in the Mid-Atlantic air gap as humanly possible. Screw significant tonnage gain, I just want to survive until May of '45. Then I'll sail to Portsmouth.