Congrats! Not too sure about CTR, if you run all-core on the L12S I suspect you're looking at just 4.0GHz or so to keep thermals in check.
Based on my experience with the 5900X+C14S in the Cerberus and someone I know with a 5900X+L12S in the Ghost S1, you're probably better off selling the L12S and getting either a C14S or U12A. Which one is better depends on how you want to set up your NR200 and how important GPU thermals are to you.
You've got plenty of clearance so unless you just can't spare the money, not much reason to take the Fuma 2 over the U12A.
But basically the consensus is that the L12S isn't really enough for the 5900X. It's not really the CPU's fault either, it wasn't exactly sufficient for a 3900X either. Only thing that changed was that the 5000s make more aggressive use of the thermal envelope they're allowed to use (90C) so it feels like they run hotter.
Curve Optimizer doesn't seem to reduce temps much or at all, it's more to move the V-F curve to get more clock out of the same Vcore. Anyways, there's a Curve Optimizer thread on TPU:
I'm testing my curve optimizer undervolts with CoreCycler, and it turns out my new 5600x's Core 1 returns rounding errors even with no offset (negative offset set to 0). Does this mean this core is defective (and if so, is it worth it to activate my warranty just for this)? Or should I attempt...
www.techpowerup.com
I'm running -10 on my two priority cores, -12 on the other CCD1 cores, and -15 on the rest. It's not too hard to work out, just test with the corecycler script for a couple of iterations. That's the limit of the 2 top cores, but the rest of the corws I haven't gone to see what the limit is.
Script to test single core stability, e.g. for PBO & Curve Optimizer on AMD Ryzen or overclocking/undervolting on Intel processors - sp00n/corecycler
github.com