This is not power feeding. First, I assume the prey sizes are a bit smaller than normal but even if they aren't... Second, there is no increase in the frequency of the feedings. Third, the "double feeding" is only short-term temporary until the snake takes the f/t rat. Fourth, as soon as the snake takes the f/t rat on the first attempt, the prey size is normal and appropriate. Fifth, the OP is not doing this to increase his BPs' weight/size, he's doing it to switch them off of ASF which is a whole other ball game.
There is no harm in a snake taking a bit larger meal (or a bit smaller meal for that matter) on a short term basis. Snakes are pretty adaptable. Remember, they are opportunistic feeders in the wild and they don't always have the choice to eat the most consistently sized prey when they're hunting.
There is a video on Moonlight Boas homepage showing this piggybacking technique with a Dumerils boa.
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