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I'm using an adjustable test load set to 4 diodes, is that right?
No. Your 1ohm is dropping 2.4V (Georg Simon Ohm says it's the law!). Adding another 0.9*4 brings up the total load voltage to 6V. Blue diodes run closer to 4.5 I think. Running 2 diodes at 2.4A or 3 diodes at 1.8A will more closely match the voltage of your laser diode.