Some good and bad news. I flipped the + for the - on the bridge inputs and this seemed to help in allowing the voltage to go beyond the point it did before. I noticed that when I place the excitation voltage on the 5V instead of pin 4 as suggested by the datasheet, the sweep is larger. So, the good is the overall sweep is pretty well dialed in as far as allowing 2kg of force, but (the bad) there seems to be no way to allow a sensitive reading. The scale is capable of sensing 1/2 a gram but I can't seem to get it to change voltage from the no load point until about 50g or so of weight. Could this be an indication of a bad amp selection? Other possibilities?