That's awesome that you guys have found a decent vet! He sounds great.
And Brady sure is a hunk! I love the shiny black kitties
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As for food, a 10ish pound cat would typically get somewhere around 200-300 calories per day (20-30 cal/lb). Supposedly, the NB Venison is around 156 calories per can, although the accuracy of that is debatable. Which means, I would feed approximately 1.5 cans per day (without the dry), give or take. That would be a good place to start, and if Brady seems overly hungry, maybe he needs a touch more. If he gains weight on that amount (perhaps take him to the vet for a weigh-in in a month), then give him a little less. Hope that helps!