TC, my suggestion in getting rid of the drafts in the kitchen cabinets would be to pull out the drawers, empty the cabinets, and do a thorough caulking job around the insides of the cabinets where they meet the walls and around any pipes, etc. which enter the cabinet spaces from the walls.
Also, depending on how these cabinets are built, often the toe-kick board does not go totally tight to the bottom of the floor of the cabinet, so when you're standing in front of the cabinet you can feel cold air rolling out onto your toes. If your toe-kicks are open at all, I would seal those off, too, with caulking if it's a small gap, or by re-facing the toe-kick with 1/8" doorskin material that is cut to cover the entire surface and close the space off. Doorskin is easy to work with, readily available in oak, mahogany, and a birch surface, can be trimmed to fit with a utility knife, attached with construction adhesive, and can be stained or painted to match your cabinets before installing, then touched up as needed in place.