Hi guys the 4mm motherboard spacer standoffs i bought arrived, i installed them and everything is running smoothly, the Thermalright AXP-100H Muscle fits in perfectly now, no flex on the side panel at all.
i have the m.2 on the back of the motherboard and the riser cable running behind the motherboard and no problems at all.
i got them from here:
comes in a pack of 100 though lol
Any issues with the I/O plate with the smaller standoffs? If not, the AXP100H may be the cooler to get - it's available for all sockets, cools well, and is similar in design to Dan's heatsink.