RPT-60B is what I have used in multiple supplies, internal in the A1200 and to replace the old C= model inside the brick for the other machines. What you've done looks very neat - even used proper plugs! I just used the pins without housings, heat shrinking each one and plugging each wire individually.
I have never used load resistors. There has always been plenty of load from the Amiga to get it started - perhaps not much of a concern when powering electronics from the 80s more so today's micro-current parts.
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