I was lazy. I didn’t want to cut another two of those copper rounds (blisters) and I figured I would just use the plate. I know it’s better to not use it.
I know it’s probably too late for this suggestion, but I would’ve heated up that triple MCPCB to remove the white solder mask, sanded it down a little, then you’ll have a blank aluminum plate.
Good luck with the build anyway! I always look forward to your builds
Looking forward to the for sale thread. :D I don't think you will be melting the TIR optics anytime soon, PILOTPTKs module also has them resting on copper and the body of my light got uncomfortably hot and the TIR optics were fine.