ASF will add weight faster then any rat will. All my BP an young BC/BI get ASF. Your braver then me feeding a snake a live adult one as ASF are ten times more vicious then rats. Build your own rat rack here:
http://www.arbreptiles.com/cages/rat_rack.html
Use 1/4" wire as ASF hoppers will climb out of 1/2". I use 1/3 (2/3 when replacing males). You can't add a male to a colony (or females sometimes). Just leave some first litters in the colony for replacements. Cheap Tractor Supply Co food food works great for feed. The new style mixing tubs need wire over the nail hole or the ASF will eat their way out.
Compared to Norway rats ASF grow slooooooooooooow. One mature ASF has more protein then a large rat. .
You found what your snake likes, get the weight on then change over to F/T. An ASF colony having a litter of 15-20 every 30 days will fill the freezer fast.
Good luck!
If you have a picky snake for some reason a stinky male rodent will get a strike before a female (from what I've seen).