After doing a bunch of mods to a 360 of mine I have noticed the motherboard edge/area right in front of the fans is flexed/warped. Not to a severe degree, but enough to notice.
I did an x-clamp replacement, 3 washers below, 2 washers above (for GPU), and I never overheated the board. I also hand-tightened the bolts, so nothing is overtight as far as I can tell.
Does anyone else know something about this? ie. is this flex a normal thing, or did I tighten something too much.