My two cents.
Feed off what you have (assuming you don't have a ton), one at a time, at weekly intervals (as Bogertophis said). I wouldn't offer two prey items.
Then, I would move to weaned rats. I wouldn't feed jumbo mice (larger than 30G). They are fatty and not as healthy for your BP.
You want to get your BP on rats sooner than later. BP's can get in the habit of liking one food item over another and you do not want to feed mice your BP's entire life.
If you have trouble switching to rats, let us know. There are tricks to get them to take them more easily. Having said that, if your BP is a good eater, I wouldn't worry about it.
You mentioned that the prey wasn't leaving a lump. That's fine. BP's aren't stretchy and I wouldn't recommend any meal that leaves a big lump. When growing, BP's can eat bigger meals relative to their size, but remember, most adult BP's don't eat more than a small rat (60-90G). My BP, Shayna, is about 1,800G (1.8kg). She eats a small rat every two weeks and maintains her weight.
As Bogertophis mentioned, a fat snake is an unhealthy snake. Better to be cautious than overly ambitious on feeding size and frequency.
Additionally, eating large meals, especially regularly, can lead to a BP refusing food. Better to eat small meals regularly than big meals infrequently.
Good luck and keep us posted.
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