My experiences are..
GE and Frigidaire...put the ice cream in metal, and dont think about trying to freeze ice cubes in plastic trays, I had a 50 Frigidaire, and while it kept food beautifully, it took 2 days to freeze ice cubes in plastic, and ice cream was very soft, A Westinghouse on the other hand will keep ice cream hard as a brick.My cousin had a 56 Hotpoint and she said it never would keep ice cream, of course these were not combinations with the seperate freezer, these, like yours had the open evaporator.,My Aunt in Georgia has the Westinghouse she started houskeeping with in 55, and it still keeps ice cream, it wont defrost itself anymore though.