Most of the mods for the SRK
A. If driver is a FET type, resistor mod to boost the amps
B. Thicker wire from driver to emitter (allow more current and less voltage loss)
C. Solder braid on the negative springs to allow more current for normal “boosted” currents…for crazy high currents like 12+ some people are actually stripping the solder mask over the traces and soldering over the traces on the end caps to thicken them to allow even more current
There are also a few developmental SRK driver boards…I know the 32*7135 Nangj style board works but there is still on going tweaking of the FET based direct drive SRK board