Two things I've experienced with mine.
When I first introduced a rat fuzzy after only feeding mice, it was like the snakes didn't recognize it as food. They took a while to sniff and explore before eating it. They weren't really excited. You may want to rub the first rat on a mouse before feeding.
The other thing I've learned is to pay more attention to the rear end of the feeder when choosing a size. Those hips don't give as much as the front end when being swallowed.
The above may be common sense to most people here but I thought it might help.
Good luck.
JohnNJ










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