I don't feed my bettas pellets, I feed them Nutrafin Max Betta Food. They're flakes, and my Bettas love them. If they do not eat it within 5-10 minutes, I scoop it out.
I have never really had a problem with my Bettas eating, so I cannot really be of much help. Maybe my dad will know, I'll ask him to look at this thread later.
Good luck with your betta!