Try to apply the 80/20 rule to your customers and ruthlessly cut out all the customers that are costing you more (in terms of money and time) vs. the ones you e

Try to apply the 80/20 rule to your customers and ruthlessly cut out all the customers that are costing you more (in terms of money and time) vs. the ones you enjoy having. You already did that with the 8% - tell them to leave, if they don't like the product/conditions/whatever, but tell them in a friendly way. I'd love to give you more advice, if you'd show me the product!