KPX 250 Gear Indicator Oil Seepage

[IdahoRider]

For the past few thousand miles, I've had some oil seepage from around the gear indicator module on my KPX 250. A hundred miles or so ago I drained the oil, pulled out the gear indicator module and replaced the rubber O ring with one of a slightly larger diameter. It definitely fit tighter when I replaced and did not have anymore oil seepage again until this week. In the attached photo you can see a small amount of oil that is just below the gear indicator module. The leak hasn't been enough for me to have to add oil between changes but it is very annoying to have even a slight oil leak.

I don't know why this would keep happening since its not a wear part so I'm thinking to pull the module again and use some Permatex 82180 Ultra Black as a surface gasket. Has anyone else had this issue and does it sound like a good idea?