Hi mate
The dreaded torque wrench. I did the same thing about 6 years ago on a 600 bandit sump nut, never again. You may not believe this I put some plumbers PFTE tape around the sump bolt till I got a new sump plate. In the end I had the bike 2 years and 4 oil changes later and I kept using the tape and said to my self I will do it next time lol. I only changed the sump when I sold the bike. Maybe a quick fix for now.