The Nutri-source feed you buy must sink more quickly than other brands. You might want to try a bag of AM 500 or Game Fish Chow to get a good idea of how much they are eating in the 15 min time window. The AM 600 seems to sink faster than the other 2.
My feed trained bass also seem to hit the sinking 600 pellets more readily than ones that are still floating. It must be a comfort zone thing.
