Biting is a growing problem even for me but the ball with socks helped me really well. Also, you can keep small towels, soak them in water, and keep them in the fridge. Give them to Max and he might enjoy it. I read this tip on lot of forums and have tried it and found it to be quite effective.
I feed Mojo 3 times a day, but he goes for potty only twice i.e. once in morning and once after the evening meal. If the time of meals and quantity can be fixed then you might face lesser problems with Max.
Since our labs are almost of the same age, we can exchange information to our benefit. If you can write me on firstname.lastname@example.org
, it would be helpful.