Circuit optimizing day

Spent the day trying to optimize my current limiter circuit by testing different kinds of transistors in Multisim.

The one I found that seems to perform the best (according to some metrics) is BD137G which in the simulator has a voltage drop of only 0.03V. Compared to the original BD243CG which has a voltage drop of 0.09V

Here is the schematic:

current_limiting_circuit_v10

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