Those look like they may be really frustrating and too difficult for regular meals. Max used to inhale his food and I sometimes used the bowl that you currently have. It didn't slow him down all that much either. We used a pacer ball. It's a ball you put in the middle of the dish and he has to eat around it. You could really use anything for the ball. We used Cooper's rubber Chuck-It ball.
Here is something on Amazon:
Amazon.com: Omega Paw Small Portion Pacer,...