Ok, Your feeding process looks good too.
There are 2 things I would change:
1. Defrost the rodent in a tub of cool water and not on the counter (this helps prevent any unnecessary bacterial growth)
2. warm the rodent up a little more. The body temperature of a rat is about 38 degrees C so that is what your BP is looking for.
If that doesn't work then it is just your BP not eating, you are doing everything right as far as I can tell. BP's are notorious for going on hunger strikes for no apparent reason. All you can do is offer an appropriately sized rodent once per week. Don't try to offer food any more often than that as offering food too often can actually stress the snake out.