Ah, more fiber in the diet eh? Betta pellets are pretty packed with protein, especially Hakari Bio-Gold.
I use Betta Bits instead of Bio-Gold, mostly because the pellets are smaller and tend to swell-up less in water. When people over-feed with bio-gold, you really notice it.
Oh, one more thing doctawife... is the 'poop' fairly solid and brownish OR is it stringy (thin) and white or clearish? Some local betta breeders believe there is a 'betta' virus that affects a betta's digestive track. The symptoms are: swollen belly with stringy/whiteish feces. Bettas with this 'virus' tend to live much shorter lives and are typically infertile, which is why breeders have taken notice.
There is some controversy about the 'betta virus', some disclaim it, some swear it is true. I have seen the symptoms first hand with another breeder, who has lost 95% of her breeding stock to it.
Its a little easier for breeders to spot stringy poop, because we typically keep bare-bottom tanks (or jars) so we can spot it easier than gravel tanks.
Regardless, the best course of action I recommend in this case is to (QT them first if not already done) go a few days without food, then feed them at 1/2 the rate before, with a weekly planned 'skip' day.
I sold a lot of my bettas to store owners, who don't feed them on Sunday (not open) and the bettas are going just great!