Sometimes I hate computers, I wrote a nice reply only to be signed off between opening this thread, and checking the forum posts, where it showed I was signed on. Well, I’ll try again.
I was going to suggest you try adjusting your anti-skate, but after doing a search on your tt, you may not have access to that adjustment.
On one website they mentioned cleaning out the old grease on the worm gear. Depending on which channel it is, would tell you if you need more or less anti-skate. The outer groove is the right channel, inner is the left.
You can access the service manual at Vinylengine, see link.
I would switch the cables to be sure it is the tt. If the imbalance is still in the same channel, then it isn’t the cartridge.
For playback you should be able to use your balance control to center the image, but that won’t help for digitizing LPs.
Once you verify it is the cartridge, if you can afford it, I would just replace or rebuild it. In my search a few people mentioned Soundsmith for B&O cartridges. https://www.sound-smith.com/lookup/bo-cartridges
There is also a bunch of good info on the Soundsmith page I linked to. Check out the troubleshooting page.