I usually feed mice to my little BP's and switch off with asf and mice for the larger BPs.
I have found that I cannot keep up with the ASF's as they grow slower than a regular rat.
Every once in awhile I spurge for gerbils, but they get pretty pricey.

Normally, if I have a problem feeder, the ASF or gerbils do the trick. I've never had a problem switching.