Great to hear you will be trying out the home cooking!
When I started this w/Tate, I pretty much just converted him over to the home cooking. I didn't do any transitioning at all and he responded quite fine. I think there may have been some looser stool in his case so on occasion, I do add pure pumpkin to the food, every now and then, for some additional fiber.
btw, Winston is soooo cute!!!