Some interesting information in this thread glad I got it going.
The tips on culling the aggressive ones I was already going to do. Tbh I didn't think culling the aggressive and keeping the calm would lead to a more friendly rat down the road. I guess I can see that working as a mental trait being passed down.
Excited to be working with Siamese picking them up on Sunday at my local show. The guy who sells the rats has very tame ones that are all handled on a daily basis from him, his wife and children.