Rats have a lot more meat on them than mice (mice are pretty much hair and bones) So a pinky rat will give your snake much much more per meal than a mouse. I know it looks small, but it's packed with everything the snake needs.
I would say stick to one pinky rat per week for a while. My BP and BRBs tend to cruise their cages more when they are hungry. (This is good exercise for them, so I always wait an extra day after I notice this before feeding.)
If you feel that you're snake has not had enough, you can defrost 2 pinkie rats next time and see if he'll take a second one after he's eaten the first. But don't feed more often than once a week. They have very slow digestion and need at least that much time.
Each time I've tried 2 pinkie rats with my BP, he's refused the second one, so be prepared to throw out a good rat if it's refused. (You can refreeze it once, but it's usually not worth it. They tend to get thin skin in the defrost process and can burst next time!
)
I've heard only good things about Rodentpro.com for frozen rats. (Unfortunately they don't ship to Switzerland.)
Handling after eating should be avoided for at least 2-3 days IMO. I read somewhere that the bones of the mouse or rat can perforate the stomach lining if the snake his handled too soon after eating. I'm not sure if that's true, but I won't take that chance with my snakes.
Mainly I think that any extra stress can cause them to regurgitate. This is icky for you and really not healthy for the snake.
I hope that helps!
