Driving parallel arrays of LEDs from a single constant current supply
You could try setting up an array of BJTs to act as a current mirror.  That would balance your load currents in each leg.  Even if the transistors aren't matched sets in the same die, they should be similar enough to use for this purpose since the 10 ohm resistor is providing feedback on VBE.  The MOSFET RDSon must be well below 1 ohm to get good matching using this method.







simulate this circuit &ndash; Schematic created using CircuitLab