Hi, did the load cell have a measuring plate that fitted on top of the cell, you have what I think is a zero offset.
Do you get changing readings whent you apply mass to the assembly?
You can do the offset correction externally with a potentiometer or with the sketch.
[soapbox] Sorry but projects like the one you have mentioned worries me when the writer cannot supply a circuit diagram, but connect a to b, c to d, must be a designer from IKEA.[/soapbox]
Tom..... 