I7-8700K Troubleshooting Guide
I7-8700K Troubleshooting Guide
Everything below 1.4 works. Moderate LLC levels are acceptable. Under 100c in a full stress test is okay. Your cooling performance is solid. The main improvement needed was to reduce fat. I tackled that and made a big difference.
Worry not, the information you received is accurate. VID isn't a voltage; it's a signal from the CPU to the motherboard. You can safely disregard it.
Mr Woof, I understand your concern. The earlier details did raise some questions in my mind.