No mention of some fr4 boards you might be making?
Luxeon Star markets a board they claim is better than aluminum w/ dielectric which is essentially the same as what’s being developed in This thread and Hoop is working on a combination DTP/sink option he mentions there.
RMM, “It won’t work right with the capacitor after the protection diode. Basically what happens is that there is enough inductance switching the FET gate at high speeds with the diode blocking the reverse voltage to boost the MCU voltage over 6V, which causes it to glitch significantly. Comfychair figured this out in this thread. The zener mod won’t work reliably unless the capacitor is directly in parallel with the capacitor after the limiting resistor, even if it is very close to the resistor or IC.
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Best explanation I’ve seen, needs to be stickied somewhere. In fact I think I’ll quote this in the Oshpark projects thread.