G'day Baz, reckon you're game shooting cats. They're uncooperative at the best of times.
What AF mode are you using? Suggest AI-Servo. As always, focus on the eyes.
Another thought is the view or angle you shoot from. Most owners, if they're not photogs, would probably shoot from above like that 6th one you posted above. If it's similar to what they can produce, why would they choose you?
Get down to the cat's level, eye level, like you did for some of the others. Much more appealing.
Had a look through POTN's pet section?