I too don't know where you got "900" from. I'm not aware of any other website that has info relevant to the LCD process.
Going by your numbers; since 42.4 sq.in. is about 0.29 sq.ft.:
1A / .29 sq.ft = 3.45 A/sq.ft.
This is toward the lower end of the LCD current density range range where 120 min. would have been appropriate. 90 min. is for 4.5 A/sq.ft. current density.
A voltage or current change that low over the entire session is suspicious. The ammeter on your power supply may not be the only thing not working.
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