You have to keep in mind that retics are very slender bodied pythons until they're very long, upwards of 12 to 15'. A 33" retic should *not* be eating med rats if our definitions of med rats are the same. And in only 4 months time, large/jumbos would also be entirely too big. Sure, the snake may, just may, be able to eventually get the meal down, but forcing it to eat the absolute maximum size prey it could possibly swallow is just bad for the animal. I guess if you want to powerfeed to get your snake breedable by two years and dead by 5 to 10, it's okay, but I like a more moderate feeding schedule for my guys 
-Chance
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Chance Duncan
www.rivervalleyexotics.com