Well, first off, there are no real advantages to feeding live over F/T. I feed live as a matter of convenience, because I breed my own feeders and it is a lot of hassle to gas then freeze then thaw and feed. Plus if a prey item isn't eaten it goes back to the holding cage for next time. I also have a few that won't take frozen, otherwise I would have long ago saved myself the additional hassle of breeding rodents. So I would recommend staying with frozen, you likely just need to increase the prey size as even rat pinkies are only useful for a short time. How long have you had the snake, and can you give us the details of the setup please? A picture would be nice too, but just the temperature of the hot spot, cool end, and the humidity at the cool end will be enough.