Have you tried their meals yet? Are they good?
Look at the labels on the "chocolate bars." Some may be snack bars, and some may be "meal replacement bars," which you don't want to snack on.

I drink a lot of coffees, and have a splash of skim milk in all of them.

Modifying the diet to suit your needs sounds like a good idea to me.. If you don't see the results you want, you can always change the diet up again.