PROBLEM SOLVED - Since I ran everything with the dim bulb test multiple times and I knew I didn't have a dead short, I pulled the DBT and ran with the variac instead. I was able to get everything up to expected voltages (or a little hotter) on the first pass. I don't know if the bulb I was using was bad (we don't have many bulbs around so grabbed the first one I saw that looked like an incandescent, maybe it's not?) or there is something off in the wiring of my DBT, but at least my PSU is working now!
Special thanks to @ItsAllInMyHead to some helpful DMs and encouraging to check for silly errors, like using the wrong lightbulb.
Calvin
Special thanks to @ItsAllInMyHead to some helpful DMs and encouraging to check for silly errors, like using the wrong lightbulb.
Calvin