8 is a huge litter!! Are you sure they are all hers?
I keep 4:1 in a 10 gallon tank and have had great luck with that. I say luck because I really think that good colonies are just that - luck. When my females deliver they lump all of the babies together. I could have hoppers, fuzzies and pinkies all in the same nest. I can also reach in and pull out the entire bunch...sex them, feed off those that I want and then put the pile back in. I try not to do this too much, but am pleased that they tolerate it. There are a few mommies that will bite when I'm rooting around, but hey - they're hammies!
New mommies can and will eat their young if they are stressed. Some may even stuff one in a pouch if they panic. I typically will take out a female who is eating a pinky and move her into a tub where I can watch her. I always seem to have a few extra males so I can put one in with her and see how she does 1 on 1. Sometimes it's the other female stressing them. <shrugs> With really aggressive females I've found that moving them into their own cage with their litter and then letting the litter grow up, they loose their aggressiveness towards other hammies and wa-la - a new breeding colony is created.
A few things - when I was starting colonies I only bought babies, I handled them a lot and I bought them from 4 or 5 different places. The handling prepared them, I think, to allow me to get into their cages and take babies easily. Yeah - they do bite..... but most will just hammy-slap me when I'm bugging them too much.
-Tonya