Thanks for the ideas guys, but no dice.@exorio
I can confirm the buttons nor the membranes are a problem, as they're as flush as they can be.@bitersnake
I have one of the older, November batch units, so the mod is definitely useful. I can say the shim isn't the problem, as I've tried closing the case without the heatsink at all to see if it's the problem. Still getting the bulge. Pressing with all my might didn't help either, it's pretty stubborn.@Neuromant1991
I've tried closing it without the switch piece inside as well, still doesn't close
EDIT: I've just tried Neuromant1991's method of closing the case...and it worked! Well, without the heatsink, battery, and other stuff that is. Going to try it again once I've reassembled everything.
EDIT 2: Nope, still no dice....
EDIT 3: Starting to suspect that one of the clips in the hinge area broke or something, but I don't see how. Anyone mind opening their unit and taking a photo of the inside of the hinge area so I can see if I broke something?
EDIT 4 (5/31/17): NVM I'VE FINALLY CLOSED MY WIN! I have indeed been misaligning the ports even though I thought I had them taken care of. Thank you all so much for your help!