Why do you still work with the useless partners?
The state of my partnership might be crap, but the worst day I’ve ever had working for myself is still better than the best day I had working for someone else.
That would be one way to kill the nuisance and find some more joy in what it looks like your self-respect forces you to do.
Keep in mind that your loyalty to your customers and your employees can and will be used against you if you don't put your foot down and put some kind of ultimatum on the table.
Then they can choose between having money in their pocket or a large chunk of nothing at all.
Best of luck with all this!