So the phone boots fine, but doesn't charge.
If you don't use R&D mode the phone bootloops, but charges.
This implies that you can switch between rd mode enabled/disabled and reproduce this behaviour 100%, yes?
Did you do obvious troubleshooting tests like boot the device while USB connected to computer or charger, and while disconnected?

This does NOT sound like a hardware problem to me.

What commands exactly did you use for the various flashings?

Share your troubleshooting process.