Have you thought of using a heatsink on the M.2 ?:

Premium N80 NVME NGFF M.2 2280 SSD Cooling Aluminum Heatsink (Gold) - modDIY.com

If not enough room what about removing the sticker to allow...

Thanks,

& Hammerite is supposed to still have a curing period of 6 weeks (but says nothing on the can about curing anymore ?) otherwise if you over-coat it before the 6-weeks is up you get that...

Only just started to finish my water cooled diy case just finished the Wiring loom...

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Had to shorten the EPS cable luckily I had a spare White EPS Molex con & keep hundreds of...