I don't know how old your BP is, but usually people end up on 7-10 day schedules for adults, or sometimes even longer. As for your boa, 7-10 day starting schedule is just fine for now. I know that people say for BP's to feed them something that is about the same size around as their thickest midsection; don't follow that for your boa. The prey you feed her shouldn't leave any noticeable lump in her body. If you do feed something that's a little bigger every once in a while, don't worry. It's just not something that should be happening every feeding.Eventually you'll need to move her to a 2 week schedule (or even longer as she gets older; my girl eats every 3 weeks now) but that won't be for a little while. Like Evenstar said, slow-grown is best.
Don't worry about not having a big snake (in comparison to your BP); even a BCI will be a BIG difference from your Ball. Not only do they grow to a size of 6-8ft on average, but their attitude is a complete 180 from Balls. My BCI (in my picture) is outgoing, exploratory, and likes being out and held. She's even been used for educational presentations. BCI's are great transitional snakes into the big boids, imo.![]()