Hi there and welcome to YT! Yeah, you jumped in with both feet, huh?
Am I reading right and you got these babies in September? As you know from your readings, 6 1/2 weeks is way too young to separate these littles from the Mama. You are very blessed that they are both doing well. So, now they are about 5 months old right?
I honestly don't have any advice for you. In all honesty, with them being so young when you got them, it was probably a good thing that you got 2 from the same litter. They probably helped each other learn some social skills (like not to bite too hard).
Please post pics when you can. Would love to see Toby and Sophie!