Just got the screw terminal plugs in today. They fit snugly, though I have not connected the PSU's yet to test. Zac, perhaps you had a different size screw terminal connector? These seem fine.
Glad to hear it worked for you! That's interesting, I purchased my screw terminal connector from the exact auction you linked to so I'd assume they're the same. I'll have to look at my other QSEs to see if they all have the same tiny center pin as the one I tested.