I would agree with the gouging being the culprit since it started leaking after the stubborn removal of the seal
Been there done that, I agree with others.. clean and flatten out any rough spots, install new seal with light coat of sealant where gouged. I would double check slip yoke for rough spots, small nicks. I also recommend this seal puller . It is a pilot bearing remover, but It is a must have for seals in tight spots
Good luck