Ok, so 24/7 overclock results are in. Been trying to find the right balance between voltage, power draw and heat.
I've settled on 4ghz, 1.325v vcore, 1.02v SOC, Standard LLC for vcore and SOC. This peaks temps at 74c in Prime 95 (small ffts) and 78c on the VRMs. OC confirmed stable with an 8hr Aida64 stress test and 10 hr Prime run (I know some will argue that isn't enough to confirm stable, but I've found that to be adequate in the past). Mem speed is 3466 16-18-18-18-36-75 @ 1.5vdimm. 1000% coverage on HCIMemtest.
Some observations, it will run 4.1ghz @ 1.425v vcore but temps reach 85c on Prime 95 where the cpu starts thermal throttling. It's perfectly fine for rendering in Blender and Handbrake etc though where temps don't exceed 80c. It will also boot and bench with 3600 ram at the same timings as above, but I can't get it beyond 130% HCImemtest coverage. I can't get it to crash in "daily" use at this mem speed though, including a 1 hr Blender render (the longest project I have) or a 2hr Adobe Premier/AE render workflow. I wonder if big coverage on HCImemtest is a bit overkill for TR?
One thing I've noticed about OC'ing TR is how "nicely" it handles failed overclocks. If you push it too far, it just hangs the system. A quick powerdown and powerup and you're back in business. No data corruption, no corrupt bios, not Wondows booting issues etc.
Hope that helps anyone dialling in thier TR OC