Have you ever tried using the MeanWell LSP-160-12 or UHP-200-12? How did you physically connect it to the board? Did you use the same 4-pin to 5.5mm adapter, or did you connect it directly to the motherboard’s ATX19 connector? What power consumption levels did you observe?
Also, when using a MeanWell power unit, assuming you place it inside the case, would you connect it using the ATX19 2 pin connector instead of using a 5.5mm barrel adapter?