ATX. Why would the bite slow after an hour and a half? Wondered what your take is on that.
My take is the molasses in the cubes. I have started fishing before, wanting to catch carp and buffalo. As soon as I start fishing, I am catching catfish, as the cubes attract carp and buffalo, we never caught another catfish. Did this many times...usually your carp and buffalo are 5-15#, and smaller fish do not seem to like to hang around the large groups of bigger fish, regardless of the species.
That is just my experience with cubes, you get the same thing with sour grain to some extent, and that is one reason not to put too much grain out at the time.