EDITED, this is not a driver issue but something more difficult
Bought a bunch of drivers from x-wossee. I know he's a good guy and I know the drivers are good quality, but something ain't right here.
I've connected my multimeter to the driver's pins which tell you current being drawn as = current in mA = 10 x millivolt reading.
Connected the driver to a NUBM07E diode after setting up the bias as described in the manual. I can get up to 1.8 Amps and my Laserbee 7W power meter shows about 2.2 Watt laser output. I know these diodes can go higher. But as I try to go higher, the reading doesn't go up, I mean both the multimeter reading from the driver pins as well as laserbee reading.
The driver and diode housing are attached to rather beefy heatsinks with some grease applied. They aren't that hot.
So not sure, maybe some overcurrent protection thing built into the driver?
I swapped the Simpledrive 5 with another one, same result. Redid the bias setting several times.