It is better to feed one big prey item than two, it reduces the amount of energy the snake has to expend eating. You should be feeding items the same size as the biggest part of your snake maybe just a little bigger. I offer my bp food about every 7 to 10 days also depending on size of last meal and shed or not. If he want eat then he is no hungery due to stress and just the fact that the last meal has held him over. But either way when they get hungery they will eat.