I made those, so can answer your questions on that.
1: Yes, they should go further onto the lamp driver, and it takes a fair amount of effort as those connectors have 23 or 28 pins that all have decent tension on them.
2: Molex has been making a lot of changes on their lineup lately and I have noticed the crimped connectors don’t have as much tension as they used to for the power headers. I’m looking into a couple changes to make them hold better. I will see if I can find any that have locking ramps in that size which will help a lot going forward.
As always, I apologize for any issues you guys are having, and am always receptive to feedback like this. It’s not easy to catch all the variables and I’m always using the feedback to improve the design.
-Hans